diff --git a/bin/update_python_build_standalone.py b/bin/update_python_build_standalone.py
index 15b425df..14f9eeda 100755
--- a/bin/update_python_build_standalone.py
+++ b/bin/update_python_build_standalone.py
@@ -3,6 +3,7 @@
 # /// script
 # dependencies = [
 #   "cibuildwheel",
+#   "requests",
 # ]
 #
 # [tool.uv.sources]
@@ -11,6 +12,8 @@
 
 import json
 
+import requests
+
 from cibuildwheel.extra import github_api_request
 from cibuildwheel.util.python_build_standalone import (
     PythonBuildStandaloneAsset,
@@ -34,8 +37,27 @@ def main() -> None:
         f"repos/astral-sh/python-build-standalone/releases/tags/{latest_tag}"
     )["assets"]
 
+    # Build a sha256 map from the SHA256SUMS file in the release
+    sha256_sums_urls = [
+        ga["browser_download_url"] for ga in github_assets if ga["name"] == "SHA256SUMS"
+    ]
+    name_to_sha256: dict[str, str] = {}
+    if sha256_sums_urls:
+        response = requests.get(sha256_sums_urls[0])
+        response.raise_for_status()
+        for line in response.text.splitlines():
+            parts = line.split()
+            if len(parts) == 2:
+                sha256_hex, filename = parts
+                # The filename may have a leading "./" or spaces - strip it
+                name_to_sha256[filename.lstrip("./")] = sha256_hex
+
     assets = [
-        PythonBuildStandaloneAsset(name=ga["name"], url=ga["browser_download_url"])
+        PythonBuildStandaloneAsset(
+            name=ga["name"],
+            url=ga["browser_download_url"],
+            sha256=name_to_sha256.get(ga["name"], ""),
+        )
         for ga in github_assets
         if ga["name"].endswith("install_only.tar.gz")
     ]
diff --git a/bin/update_pythons.py b/bin/update_pythons.py
index 3251efb5..c8312a2c 100755
--- a/bin/update_pythons.py
+++ b/bin/update_pythons.py
@@ -15,12 +15,13 @@
 from __future__ import annotations
 
 import difflib
+import hashlib
 import logging
 import operator
 import re
 import tomllib
 from pathlib import Path
-from typing import Any, Final, Literal, TypedDict
+from typing import Any, Final, Literal, NotRequired, TypedDict
 from xml.etree import ElementTree as ET
 
 import click
@@ -56,6 +57,7 @@ class Config(TypedDict):
 
 class ConfigUrl(Config):
     url: str
+    sha256: NotRequired[str]
 
 
 class ConfigPyodide(Config):
@@ -179,10 +181,23 @@ class GraalPyVersions:
         ]
         if urls:
             (url,) = urls
+            # Fetch sha256 from the ".sha256" sidecar asset in the same release
+            sha256 = ""
+            sha256_asset_name = url.rsplit("/", 1)[-1] + ".sha256"
+            sha256_urls = [
+                rf["browser_download_url"]
+                for rf in release["assets"]
+                if rf["name"] == sha256_asset_name
+            ]
+            if sha256_urls:
+                sha256_response = requests.get(sha256_urls[0])
+                sha256_response.raise_for_status()
+                sha256 = sha256_response.text.strip().split()[0]
             return ConfigUrl(
                 identifier=identifier,
                 version=f"{version.major}.{version.minor}",
                 url=url,
+                sha256=sha256,
             )
         return None
 
@@ -298,12 +313,14 @@ class CPythonVersions:
             uri = self.versions_dict[new_version]
             files = [rf for rf in self.files_info if rf["release"] == uri]
 
-            urls = [rf["url"] for rf in files if file_ident in rf["url"]]
-            if urls:
+            matching = [rf for rf in files if file_ident in rf["url"]]
+            if matching:
+                rf = matching[0]
                 return ConfigUrl(
                     identifier=identifier,
                     version=f"{new_version.major}.{new_version.minor}",
-                    url=urls[0],
+                    url=rf["url"],
+                    sha256=rf.get("sha256_sum", ""),
                 )
 
         return None
@@ -448,6 +465,16 @@ class AllVersions:
 
         self.pyodide = PyodideVersions()
 
+    def _stream_sha256(self, url: str) -> str:
+        """Download a file (streaming) and return its SHA256 hex digest."""
+        log.debug("Computing sha256 for %s by streaming download...", url)
+        response = requests.get(url, stream=True)
+        response.raise_for_status()
+        hasher = hashlib.sha256()
+        for chunk in response.iter_content(65536):
+            hasher.update(chunk)
+        return hasher.hexdigest()
+
     def update_config(self, config: MutableMapping[str, str]) -> None:
         identifier = config["identifier"]
         version = Version(config["version"])
@@ -505,6 +532,20 @@ class AllVersions:
             )
 
         assert config_update is not None, f"{identifier} not found!"
+
+        # Fill in sha256 for URL-based configs if not already provided by the
+        # update_version_* method (e.g. PyPy, BeeWare iOS, Maven have no sidecar).
+        # Widen the type to allow arbitrary key access on the underlying dict.
+        config_update_dict: dict[str, str] = config_update  # type: ignore[assignment]
+        if "url" in config_update_dict and "sha256" not in config_update_dict:
+            url = config_update_dict["url"]
+            existing_sha256 = config.get("sha256", "")
+            if url == config.get("url") and existing_sha256:
+                # URL unchanged — preserve the existing sha256
+                config_update_dict["sha256"] = existing_sha256
+            else:
+                config_update_dict["sha256"] = self._stream_sha256(url)
+
         if config_update != config:
             log.info("  Updated %s to %s", config, config_update)
             config.clear()
diff --git a/bin/update_virtualenv.py b/bin/update_virtualenv.py
index c51c8725..63793162 100755
--- a/bin/update_virtualenv.py
+++ b/bin/update_virtualenv.py
@@ -4,6 +4,7 @@
 # dependencies = [
 #   "click",
 #   "packaging",
+#   "requests",
 #   "rich",
 #   "cibuildwheel",
 # ]
@@ -15,12 +16,14 @@
 
 import dataclasses
 import difflib
+import hashlib
 import logging
 import tomllib
 from pathlib import Path
 from typing import Final
 
 import click
+import requests
 import rich
 from packaging.version import Version
 from rich.logging import RichHandler
@@ -92,16 +95,26 @@ def update_virtualenv(force: bool, level: str) -> None:
     if latest_release.version > Version(local_version):
         version = latest_release.name
         url = latest_release.download_url
+        # Compute sha256 by streaming the new download
+        log.info("Computing sha256 for %s...", url)
+        response = requests.get(url, stream=True)
+        response.raise_for_status()
+        hasher = hashlib.sha256()
+        for chunk in response.iter_content(65536):
+            hasher.update(chunk)
+        sha256 = hasher.hexdigest()
     else:
         version = local_version
         url = default["url"]
+        sha256 = default.get("sha256", "")
 
     configurations["default"] = {
         "version": version,
         "url": url,
+        "sha256": sha256,
     }
     result_toml = "".join(
-        f'{key} = {{ version = "{value["version"]}", url = "{value["url"]}" }}\n'
+        f'{key} = {{ version = "{value["version"]}", url = "{value["url"]}", sha256 = "{value.get("sha256", "")}" }}\n'
         for key, value in configurations.items()
     )
 
diff --git a/cibuildwheel/platforms/android.py b/cibuildwheel/platforms/android.py
index b8bd4bf5..94097d1b 100644
--- a/cibuildwheel/platforms/android.py
+++ b/cibuildwheel/platforms/android.py
@@ -72,6 +72,7 @@ class PythonConfiguration:
     version: str
     identifier: str
     url: str
+    sha256: str = ""
 
     @property
     def arch(self) -> str:
@@ -184,7 +185,7 @@ def setup_target_python(config: PythonConfiguration, build_path: Path) -> Path:
     python_tgz = CIBW_CACHE_PATH / config.url.rpartition("/")[-1]
     with FileLock(f"{python_tgz}.lock"):
         if not python_tgz.exists():
-            download(config.url, python_tgz)
+            download(config.url, python_tgz, sha256=config.sha256 or None)
 
     python_dir = build_path / "python"
     python_dir.mkdir()
diff --git a/cibuildwheel/platforms/ios.py b/cibuildwheel/platforms/ios.py
index 223a833f..9cbb7d81 100644
--- a/cibuildwheel/platforms/ios.py
+++ b/cibuildwheel/platforms/ios.py
@@ -46,6 +46,7 @@ class PythonConfiguration:
     identifier: str
     url: str
     build_url: str
+    sha256: str = ""
 
     @property
     def sdk(self) -> str:
@@ -133,7 +134,7 @@ def install_target_cpython(tmp: Path, config: PythonConfiguration, free_threadin
     with FileLock(str(installation_path) + ".lock"):
         if not installation_path.exists():
             downloaded_tar_gz = tmp / ios_python_tar_gz
-            download(config.url, downloaded_tar_gz)
+            download(config.url, downloaded_tar_gz, sha256=config.sha256 or None)
             installation_path.mkdir(parents=True, exist_ok=True)
             call("tar", "-C", installation_path, "-xf", downloaded_tar_gz)
             downloaded_tar_gz.unlink()
diff --git a/cibuildwheel/platforms/macos.py b/cibuildwheel/platforms/macos.py
index 3208bcd1..e5b97200 100644
--- a/cibuildwheel/platforms/macos.py
+++ b/cibuildwheel/platforms/macos.py
@@ -88,6 +88,7 @@ class PythonConfiguration:
     version: str
     identifier: str
     url: str
+    sha256: str = ""
 
 
 def all_python_configurations() -> list[PythonConfiguration]:
@@ -135,7 +136,9 @@ def get_python_configurations(
     return python_configurations
 
 
-def install_cpython(_tmp: Path, version: str, url: str, free_threading: bool) -> Path:
+def install_cpython(
+    _tmp: Path, version: str, url: str, free_threading: bool, sha256: str = ""
+) -> Path:
     ft = "T" if free_threading else ""
     installation_path = Path(f"/Library/Frameworks/Python{ft}.framework/Versions/{version}")
     with FileLock(CIBW_CACHE_PATH / f"cpython{version}.lock"):
@@ -161,7 +164,7 @@ def install_cpython(_tmp: Path, version: str, url: str, free_threading: bool) ->
             python_filename = url.rsplit("/", maxsplit=1)[-1]
             pkg_path = CIBW_CACHE_PATH / "cpython-installer" / python_filename
             if not pkg_path.exists():
-                download(url, pkg_path)
+                download(url, pkg_path, sha256=sha256 or None)
             args = []
             if version.startswith("3.14"):
                 args += ["-applyChoiceChangesXML", str(resources.FREE_THREAD_ENABLE_314.resolve())]
@@ -185,7 +188,7 @@ def install_cpython(_tmp: Path, version: str, url: str, free_threading: bool) ->
     return installation_path / "bin" / (f"python{version}t" if free_threading else "python3")
 
 
-def install_pypy(tmp: Path, url: str) -> Path:
+def install_pypy(tmp: Path, url: str, sha256: str = "") -> Path:
     pypy_tar_bz2 = url.rsplit("/", 1)[-1]
     extension = ".tar.bz2"
     assert pypy_tar_bz2.endswith(extension)
@@ -193,14 +196,14 @@ def install_pypy(tmp: Path, url: str) -> Path:
     with FileLock(str(installation_path) + ".lock"):
         if not installation_path.exists():
             downloaded_tar_bz2 = tmp / pypy_tar_bz2
-            download(url, downloaded_tar_bz2)
+            download(url, downloaded_tar_bz2, sha256=sha256 or None)
             installation_path.parent.mkdir(parents=True, exist_ok=True)
             call("tar", "-C", installation_path.parent, "-xf", downloaded_tar_bz2)
             downloaded_tar_bz2.unlink()
     return installation_path / "bin" / "pypy3"
 
 
-def install_graalpy(tmp: Path, url: str) -> Path:
+def install_graalpy(tmp: Path, url: str, sha256: str = "") -> Path:
     graalpy_archive = url.rsplit("/", 1)[-1]
     extension = ".tar.gz"
     assert graalpy_archive.endswith(extension)
@@ -208,7 +211,7 @@ def install_graalpy(tmp: Path, url: str) -> Path:
     with FileLock(str(installation_path) + ".lock"):
         if not installation_path.exists():
             downloaded_archive = tmp / graalpy_archive
-            download(url, downloaded_archive)
+            download(url, downloaded_archive, sha256=sha256 or None)
             installation_path.mkdir(parents=True)
             # GraalPy top-folder name is inconsistent with archive name
             call("tar", "-C", installation_path, "--strip-components=1", "-xzf", downloaded_archive)
@@ -232,13 +235,17 @@ def setup_python(
     if implementation_id.startswith("cp"):
         free_threading = "t-macos" in python_configuration.identifier
         base_python = install_cpython(
-            tmp, python_configuration.version, python_configuration.url, free_threading
+            tmp,
+            python_configuration.version,
+            python_configuration.url,
+            free_threading,
+            python_configuration.sha256,
         )
 
     elif implementation_id.startswith("pp"):
-        base_python = install_pypy(tmp, python_configuration.url)
+        base_python = install_pypy(tmp, python_configuration.url, python_configuration.sha256)
     elif implementation_id.startswith("gp"):
-        base_python = install_graalpy(tmp, python_configuration.url)
+        base_python = install_graalpy(tmp, python_configuration.url, python_configuration.sha256)
     else:
         msg = "Unknown Python implementation"
         raise ValueError(msg)
diff --git a/cibuildwheel/resources/build-platforms.toml b/cibuildwheel/resources/build-platforms.toml
index 2dabfd3b..375ffd3c 100644
--- a/cibuildwheel/resources/build-platforms.toml
+++ b/cibuildwheel/resources/build-platforms.toml
@@ -143,43 +143,43 @@ python_configurations = [
 
 [macos]
 python_configurations = [
-  { identifier = "cp39-macosx_x86_64", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg" },
-  { identifier = "cp39-macosx_arm64", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg" },
-  { identifier = "cp39-macosx_universal2", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg" },
-  { identifier = "cp310-macosx_x86_64", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg" },
-  { identifier = "cp310-macosx_arm64", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg" },
-  { identifier = "cp310-macosx_universal2", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg" },
-  { identifier = "cp311-macosx_x86_64", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg" },
-  { identifier = "cp311-macosx_arm64", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg" },
-  { identifier = "cp311-macosx_universal2", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg" },
-  { identifier = "cp312-macosx_x86_64", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg" },
-  { identifier = "cp312-macosx_arm64", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg" },
-  { identifier = "cp312-macosx_universal2", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg" },
-  { identifier = "cp313-macosx_x86_64", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg" },
-  { identifier = "cp313-macosx_arm64", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg" },
-  { identifier = "cp313-macosx_universal2", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg" },
-  { identifier = "cp314-macosx_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp314-macosx_arm64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp314-macosx_universal2", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp314t-macosx_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp314t-macosx_arm64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp314t-macosx_universal2", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg" },
-  { identifier = "cp315-macosx_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "cp315-macosx_arm64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "cp315-macosx_universal2", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "cp315t-macosx_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "cp315t-macosx_arm64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "cp315t-macosx_universal2", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg" },
-  { identifier = "pp39-macosx_x86_64", version = "3.9", url = "https://downloads.python.org/pypy/pypy3.9-v7.3.16-macos_x86_64.tar.bz2" },
-  { identifier = "pp39-macosx_arm64", version = "3.9", url = "https://downloads.python.org/pypy/pypy3.9-v7.3.16-macos_arm64.tar.bz2" },
-  { identifier = "pp310-macosx_x86_64", version = "3.10", url = "https://downloads.python.org/pypy/pypy3.10-v7.3.19-macos_x86_64.tar.bz2" },
-  { identifier = "pp310-macosx_arm64", version = "3.10", url = "https://downloads.python.org/pypy/pypy3.10-v7.3.19-macos_arm64.tar.bz2" },
-  { identifier = "pp311-macosx_x86_64", version = "3.11", url = "https://downloads.python.org/pypy/pypy3.11-v7.3.23-macos_x86_64.tar.bz2" },
-  { identifier = "pp311-macosx_arm64", version = "3.11", url = "https://downloads.python.org/pypy/pypy3.11-v7.3.23-macos_arm64.tar.bz2" },
-  { identifier = "gp311_242-macosx_x86_64", version = "3.11", url = "https://github.com/oracle/graalpython/releases/download/graal-24.2.2/graalpy-24.2.2-macos-amd64.tar.gz" },
-  { identifier = "gp311_242-macosx_arm64", version = "3.11", url = "https://github.com/oracle/graalpython/releases/download/graal-24.2.2/graalpy-24.2.2-macos-aarch64.tar.gz" },
-  { identifier = "gp312_250-macosx_x86_64", version = "3.12", url = "https://github.com/oracle/graalpython/releases/download/graal-25.0.1/graalpy-25.0.1-macos-amd64.tar.gz" },
-  { identifier = "gp312_250-macosx_arm64", version = "3.12", url = "https://github.com/oracle/graalpython/releases/download/graal-25.0.3/graalpy-25.0.3-macos-aarch64.tar.gz" },
+  { identifier = "cp39-macosx_x86_64", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp39-macosx_arm64", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp39-macosx_universal2", version = "3.9", url = "https://www.python.org/ftp/python/3.9.13/python-3.9.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp310-macosx_x86_64", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg", sha256 = "" },
+  { identifier = "cp310-macosx_arm64", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg", sha256 = "" },
+  { identifier = "cp310-macosx_universal2", version = "3.10", url = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-macos11.pkg", sha256 = "" },
+  { identifier = "cp311-macosx_x86_64", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg", sha256 = "" },
+  { identifier = "cp311-macosx_arm64", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg", sha256 = "" },
+  { identifier = "cp311-macosx_universal2", version = "3.11", url = "https://www.python.org/ftp/python/3.11.9/python-3.11.9-macos11.pkg", sha256 = "" },
+  { identifier = "cp312-macosx_x86_64", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg", sha256 = "" },
+  { identifier = "cp312-macosx_arm64", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg", sha256 = "" },
+  { identifier = "cp312-macosx_universal2", version = "3.12", url = "https://www.python.org/ftp/python/3.12.10/python-3.12.10-macos11.pkg", sha256 = "" },
+  { identifier = "cp313-macosx_x86_64", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp313-macosx_arm64", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp313-macosx_universal2", version = "3.13", url = "https://www.python.org/ftp/python/3.13.13/python-3.13.13-macos11.pkg", sha256 = "" },
+  { identifier = "cp314-macosx_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp314-macosx_arm64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp314-macosx_universal2", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp314t-macosx_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp314t-macosx_arm64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp314t-macosx_universal2", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-macos11.pkg", sha256 = "" },
+  { identifier = "cp315-macosx_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "cp315-macosx_arm64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "cp315-macosx_universal2", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "cp315t-macosx_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "cp315t-macosx_arm64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "cp315t-macosx_universal2", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-macos11.pkg", sha256 = "" },
+  { identifier = "pp39-macosx_x86_64", version = "3.9", url = "https://downloads.python.org/pypy/pypy3.9-v7.3.16-macos_x86_64.tar.bz2", sha256 = "" },
+  { identifier = "pp39-macosx_arm64", version = "3.9", url = "https://downloads.python.org/pypy/pypy3.9-v7.3.16-macos_arm64.tar.bz2", sha256 = "" },
+  { identifier = "pp310-macosx_x86_64", version = "3.10", url = "https://downloads.python.org/pypy/pypy3.10-v7.3.19-macos_x86_64.tar.bz2", sha256 = "" },
+  { identifier = "pp310-macosx_arm64", version = "3.10", url = "https://downloads.python.org/pypy/pypy3.10-v7.3.19-macos_arm64.tar.bz2", sha256 = "" },
+  { identifier = "pp311-macosx_x86_64", version = "3.11", url = "https://downloads.python.org/pypy/pypy3.11-v7.3.23-macos_x86_64.tar.bz2", sha256 = "" },
+  { identifier = "pp311-macosx_arm64", version = "3.11", url = "https://downloads.python.org/pypy/pypy3.11-v7.3.23-macos_arm64.tar.bz2", sha256 = "" },
+  { identifier = "gp311_242-macosx_x86_64", version = "3.11", url = "https://github.com/oracle/graalpython/releases/download/graal-24.2.2/graalpy-24.2.2-macos-amd64.tar.gz", sha256 = "" },
+  { identifier = "gp311_242-macosx_arm64", version = "3.11", url = "https://github.com/oracle/graalpython/releases/download/graal-24.2.2/graalpy-24.2.2-macos-aarch64.tar.gz", sha256 = "" },
+  { identifier = "gp312_250-macosx_x86_64", version = "3.12", url = "https://github.com/oracle/graalpython/releases/download/graal-25.0.1/graalpy-25.0.1-macos-amd64.tar.gz", sha256 = "" },
+  { identifier = "gp312_250-macosx_arm64", version = "3.12", url = "https://github.com/oracle/graalpython/releases/download/graal-25.0.3/graalpy-25.0.3-macos-aarch64.tar.gz", sha256 = "" },
 ]
 
 [windows]
@@ -227,23 +227,23 @@ python_configurations = [
 
 [android]
 python_configurations = [
-  { identifier = "cp313-android_arm64_v8a", version = "3.13", url = "https://repo.maven.apache.org/maven2/com/chaquo/python/python/3.13.13/python-3.13.13-aarch64-linux-android.tar.gz" },
-  { identifier = "cp313-android_x86_64", version = "3.13", url = "https://repo.maven.apache.org/maven2/com/chaquo/python/python/3.13.13/python-3.13.13-x86_64-linux-android.tar.gz" },
-  { identifier = "cp314-android_arm64_v8a", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-aarch64-linux-android.tar.gz" },
-  { identifier = "cp314-android_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-x86_64-linux-android.tar.gz" },
-  { identifier = "cp315-android_arm64_v8a", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-aarch64-linux-android.tar.gz" },
-  { identifier = "cp315-android_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-x86_64-linux-android.tar.gz" },
+  { identifier = "cp313-android_arm64_v8a", version = "3.13", url = "https://repo.maven.apache.org/maven2/com/chaquo/python/python/3.13.13/python-3.13.13-aarch64-linux-android.tar.gz", sha256 = "" },
+  { identifier = "cp313-android_x86_64", version = "3.13", url = "https://repo.maven.apache.org/maven2/com/chaquo/python/python/3.13.13/python-3.13.13-x86_64-linux-android.tar.gz", sha256 = "" },
+  { identifier = "cp314-android_arm64_v8a", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-aarch64-linux-android.tar.gz", sha256 = "" },
+  { identifier = "cp314-android_x86_64", version = "3.14", url = "https://www.python.org/ftp/python/3.14.5/python-3.14.5-x86_64-linux-android.tar.gz", sha256 = "" },
+  { identifier = "cp315-android_arm64_v8a", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-aarch64-linux-android.tar.gz", sha256 = "" },
+  { identifier = "cp315-android_x86_64", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-x86_64-linux-android.tar.gz", sha256 = "" },
 ]
 
 [ios]
 python_configurations = [
-  { identifier = "cp313-ios_arm64_iphoneos", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz" },
-  { identifier = "cp313-ios_x86_64_iphonesimulator", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz" },
-  { identifier = "cp313-ios_arm64_iphonesimulator", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz" },
-  { identifier = "cp314-ios_arm64_iphoneos", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz" },
-  { identifier = "cp314-ios_x86_64_iphonesimulator", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz" },
-  { identifier = "cp314-ios_arm64_iphonesimulator", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz" },
-  { identifier = "cp315-ios_arm64_iphoneos", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz" },
-  { identifier = "cp315-ios_x86_64_iphonesimulator", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz" },
-  { identifier = "cp315-ios_arm64_iphonesimulator", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz" },
+  { identifier = "cp313-ios_arm64_iphoneos", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz", sha256 = "" },
+  { identifier = "cp313-ios_x86_64_iphonesimulator", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz", sha256 = "" },
+  { identifier = "cp313-ios_arm64_iphonesimulator", version = "3.13", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.13-b13/Python-3.13-iOS-support.b13.tar.gz", sha256 = "" },
+  { identifier = "cp314-ios_arm64_iphoneos", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz", sha256 = "" },
+  { identifier = "cp314-ios_x86_64_iphonesimulator", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz", sha256 = "" },
+  { identifier = "cp314-ios_arm64_iphonesimulator", version = "3.14", url = "https://github.com/beeware/Python-Apple-support/releases/download/3.14-b9/Python-3.14-iOS-support.b9.tar.gz", sha256 = "" },
+  { identifier = "cp315-ios_arm64_iphoneos", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz", sha256 = "" },
+  { identifier = "cp315-ios_x86_64_iphonesimulator", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz", sha256 = "" },
+  { identifier = "cp315-ios_arm64_iphonesimulator", version = "3.15", url = "https://www.python.org/ftp/python/3.15.0/python-3.15.0b1-iOS-XCframework.tar.gz", sha256 = "" },
 ]
diff --git a/cibuildwheel/resources/python-build-standalone-releases.json b/cibuildwheel/resources/python-build-standalone-releases.json
index f5df07be..129c31fd 100644
--- a/cibuildwheel/resources/python-build-standalone-releases.json
+++ b/cibuildwheel/resources/python-build-standalone-releases.json
@@ -5,719 +5,898 @@
       "assets": [
         {
           "name": "cpython-3.10.20+20260408-aarch64-apple-darwin-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-apple-darwin-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-apple-darwin-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-aarch64-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-aarch64-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-aarch64-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-i686-pc-windows-msvc-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-i686-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-i686-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-riscv64-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-riscv64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-riscv64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-s390x-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-s390x-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-s390x-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64-apple-darwin-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-apple-darwin-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-apple-darwin-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64-pc-windows-msvc-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.10.20+20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.10.20%2B20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.11.15+20260408-aarch64-apple-darwin-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.11.15%2B20260408-aarch64-apple-darwin-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.11.15%2B20260408-aarch64-apple-darwin-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.11.15+20260408-aarch64-pc-windows-msvc-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.11.15%2B20260408-aarch64-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.11.15%2B20260408-aarch64-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
         },
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-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
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         {
           "name": "cpython-3.15.0a8+20260408-aarch64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
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         {
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-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
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         {
           "name": "cpython-3.15.0a8+20260408-aarch64-unknown-linux-musl-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-musl-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-musl-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
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-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-aarch64-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-armv7-unknown-linux-gnueabi-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabi-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabi-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabi-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-armv7-unknown-linux-gnueabihf-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabihf-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabihf-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-armv7-unknown-linux-gnueabihf-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-i686-pc-windows-msvc-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-i686-pc-windows-msvc-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-i686-pc-windows-msvc-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-i686-pc-windows-msvc-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-i686-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-i686-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-ppc64le-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-ppc64le-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-ppc64le-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-ppc64le-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-riscv64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-riscv64-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-riscv64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-riscv64-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-riscv64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-riscv64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-s390x-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-s390x-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-s390x-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-s390x-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-s390x-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-s390x-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-apple-darwin-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-apple-darwin-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-apple-darwin-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-apple-darwin-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-apple-darwin-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-apple-darwin-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-pc-windows-msvc-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-pc-windows-msvc-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-pc-windows-msvc-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-pc-windows-msvc-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-pc-windows-msvc-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-pc-windows-msvc-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-unknown-linux-musl-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-musl-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-musl-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
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           "name": "cpython-3.15.0a8+20260408-x86_64_v2-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
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           "name": "cpython-3.15.0a8+20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
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           "name": "cpython-3.15.0a8+20260408-x86_64_v2-unknown-linux-musl-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-musl-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-musl-freethreaded-install_only.tar.gz",
+          "sha256": ""
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         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v2-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
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         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v3-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v3-unknown-linux-musl-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-musl-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-musl-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v3-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v4-unknown-linux-gnu-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-gnu-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-gnu-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-gnu-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v4-unknown-linux-musl-freethreaded-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-musl-freethreaded-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-musl-freethreaded-install_only.tar.gz",
+          "sha256": ""
         },
         {
           "name": "cpython-3.15.0a8+20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz",
-          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz"
+          "url": "https://github.com/astral-sh/python-build-standalone/releases/download/20260408/cpython-3.15.0a8%2B20260408-x86_64_v4-unknown-linux-musl-install_only.tar.gz",
+          "sha256": ""
         }
       ]
     }
diff --git a/cibuildwheel/resources/virtualenv.toml b/cibuildwheel/resources/virtualenv.toml
index 3ec56edd..b6441b86 100644
--- a/cibuildwheel/resources/virtualenv.toml
+++ b/cibuildwheel/resources/virtualenv.toml
@@ -1 +1 @@
-default = { version = "21.3.3", url = "https://github.com/pypa/get-virtualenv/releases/download/21.3.3/virtualenv.pyz" }
+default = { version = "21.3.3", url = "https://github.com/pypa/get-virtualenv/releases/download/21.3.3/virtualenv.pyz", sha256 = "" }
diff --git a/cibuildwheel/util/file.py b/cibuildwheel/util/file.py
index eaec2648..45a7932f 100644
--- a/cibuildwheel/util/file.py
+++ b/cibuildwheel/util/file.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import hashlib
 import os
 import shutil
 import ssl
@@ -45,7 +46,7 @@ def ensure_cache_sentinel(cache_path: Path) -> None:
             )
 
 
-def download(url: str, dest: Path) -> None:
+def download(url: str, dest: Path, *, sha256: str | None = None) -> None:
     print(f"+ Download {url} to {dest}")
     dest_dir = dest.parent
     dest_dir.mkdir(parents=True, exist_ok=True)
@@ -59,13 +60,20 @@ def download(url: str, dest: Path) -> None:
         try:
             with urllib.request.urlopen(url, context=context) as response:
                 dest.write_bytes(response.read())
-                return
+                break
 
         except OSError:
             if i == repeat_num - 1:
                 raise
             time.sleep(3)
 
+    if sha256:
+        computed = hashlib.sha256(dest.read_bytes()).hexdigest()
+        if computed != sha256:
+            dest.unlink(missing_ok=True)
+            msg = f"SHA256 mismatch for {url}: expected {sha256!r}, got {computed!r}"
+            raise FatalError(msg)
+
 
 def extract_zip(zip_src: Path, dest: Path) -> None:
     """Extracts a zip and correctly sets permissions on extracted files.
diff --git a/cibuildwheel/util/python_build_standalone.py b/cibuildwheel/util/python_build_standalone.py
index f6f9897e..96783bc1 100644
--- a/cibuildwheel/util/python_build_standalone.py
+++ b/cibuildwheel/util/python_build_standalone.py
@@ -19,6 +19,7 @@ if TYPE_CHECKING:
 class PythonBuildStandaloneAsset(typing.TypedDict):
     name: str
     url: str
+    sha256: str
 
 
 class PythonBuildStandaloneRelease(typing.TypedDict):
@@ -86,8 +87,8 @@ def _get_pbs_asset(
     arch_identifier: str,
     platform_identifier: str,
     libc_identifier: str | None,
-) -> tuple[str, str, str]:
-    """Finds the asset, returning (tag, filename, url)."""
+) -> tuple[str, str, str, str]:
+    """Finds the asset, returning (tag, url, filename, sha256)."""
     release_data = get_python_build_standalone_release_data()
 
     expected_suffix = f"{arch_identifier}-{platform_identifier}"
@@ -105,14 +106,17 @@ def _get_pbs_asset(
                 continue
 
             asset_url = asset["url"]
-            return release["tag"], asset_url, asset_name
+            asset_sha256 = asset.get("sha256", "")
+            return release["tag"], asset_url, asset_name, asset_sha256
 
     # If loop completes without finding a match
     msg = f"Could not find python-build-standalone release asset matching {asset_pattern!r}."
     raise PythonBuildStandaloneError(msg)
 
 
-def _download_or_get_from_cache(asset_url: str, asset_filename: str, cache_dir: Path) -> Path:
+def _download_or_get_from_cache(
+    asset_url: str, asset_filename: str, cache_dir: Path, sha256: str = ""
+) -> Path:
     with FileLock(cache_dir / (asset_filename + ".lock")):
         asset_cache_path = cache_dir / asset_filename
         if asset_cache_path.is_file():
@@ -120,7 +124,7 @@ def _download_or_get_from_cache(asset_url: str, asset_filename: str, cache_dir:
             return asset_cache_path
 
         print(f"Downloading python_build_standalone: {asset_url} to {asset_cache_path}")
-        download(asset_url, asset_cache_path)
+        download(asset_url, asset_cache_path, sha256=sha256 or None)
         return asset_cache_path
 
 
@@ -166,7 +170,7 @@ def create_python_build_standalone_environment(
 
     arch_id, platform_id, libc_id = _get_platform_identifiers()
 
-    pbs_tag, asset_url, asset_filename = _get_pbs_asset(
+    pbs_tag, asset_url, asset_filename, asset_sha256 = _get_pbs_asset(
         python_version=python_version,
         arch_identifier=arch_id,
         platform_identifier=platform_id,
@@ -176,7 +180,7 @@ def create_python_build_standalone_environment(
     print(f"Using python-build-standalone release: {pbs_tag}")
 
     archive_path = _download_or_get_from_cache(
-        asset_url=asset_url, asset_filename=asset_filename, cache_dir=cache_dir
+        asset_url=asset_url, asset_filename=asset_filename, cache_dir=cache_dir, sha256=asset_sha256
     )
 
     python_base_dir = temp_dir / "pbs"
diff --git a/cibuildwheel/venv.py b/cibuildwheel/venv.py
index 91c21f06..a90ad562 100644
--- a/cibuildwheel/venv.py
+++ b/cibuildwheel/venv.py
@@ -53,10 +53,11 @@ def _ensure_virtualenv(version: str) -> tuple[Path, Version]:
     configuration = loaded_file.get(key, loaded_file["default"])
     version = str(configuration["version"])
     url = str(configuration["url"])
+    sha256 = str(configuration.get("sha256", ""))
     path = CIBW_CACHE_PATH / f"virtualenv-{version}.pyz"
     with FileLock(str(path) + ".lock"):
         if not path.exists():
-            download(url, path)
+            download(url, path, sha256=sha256 or None)
     return (path, Version(version))