diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index 5ada8ab2..e8dfb775 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -17,8 +17,8 @@ def get_python_configurations(build_selector):
         PythonConfiguration(version='2.7', identifier='cp27-macosx_10_6_intel', url='https://www.python.org/ftp/python/2.7.17/python-2.7.17-macosx10.6.pkg'),
         PythonConfiguration(version='3.5', identifier='cp35-macosx_10_6_intel', url='https://www.python.org/ftp/python/3.5.4/python-3.5.4-macosx10.6.pkg'),
         PythonConfiguration(version='3.6', identifier='cp36-macosx_10_6_intel', url='https://www.python.org/ftp/python/3.6.8/python-3.6.8-macosx10.6.pkg'),
-        PythonConfiguration(version='3.7', identifier='cp37-macosx_10_6_intel', url='https://www.python.org/ftp/python/3.7.5/python-3.7.5-macosx10.6.pkg'),
-        PythonConfiguration(version='3.8', identifier='cp38-macosx_10_9_x86_64', url='https://www.python.org/ftp/python/3.8.0/python-3.8.0-macosx10.9.pkg'),
+        PythonConfiguration(version='3.7', identifier='cp37-macosx_10_6_intel', url='https://www.python.org/ftp/python/3.7.6/python-3.7.6-macosx10.6.pkg'),
+        PythonConfiguration(version='3.8', identifier='cp38-macosx_10_9_x86_64', url='https://www.python.org/ftp/python/3.8.1/python-3.8.1-macosx10.9.pkg'),
     ]
 
     # skip builds as required
@@ -50,7 +50,7 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
         return subprocess.check_call(args, env=env, cwd=cwd, shell=shell)
 
     # get latest pip once and for all
-    
+
     call(['curl', '-L', '--retry', '3', '--retry-delay', '3', '-o', get_pip_script, get_pip_url])
 
     for config in python_configurations:
diff --git a/cibuildwheel/windows.py b/cibuildwheel/windows.py
index 61999fcc..c0923934 100644
--- a/cibuildwheel/windows.py
+++ b/cibuildwheel/windows.py
@@ -41,10 +41,10 @@ def get_python_configurations(build_selector):
         PythonConfiguration(version='3.5.4', arch="64", identifier='cp35-win_amd64'),
         PythonConfiguration(version='3.6.8', arch="32", identifier='cp36-win32'),
         PythonConfiguration(version='3.6.8', arch="64", identifier='cp36-win_amd64'),
-        PythonConfiguration(version='3.7.5', arch="32", identifier='cp37-win32'),
-        PythonConfiguration(version='3.7.5', arch="64", identifier='cp37-win_amd64'),
-        PythonConfiguration(version='3.8.0', arch="32", identifier='cp38-win32'),
-        PythonConfiguration(version='3.8.0', arch="64", identifier='cp38-win_amd64'),
+        PythonConfiguration(version='3.7.6', arch="32", identifier='cp37-win32'),
+        PythonConfiguration(version='3.7.6', arch="64", identifier='cp37-win_amd64'),
+        PythonConfiguration(version='3.8.1', arch="32", identifier='cp38-win32'),
+        PythonConfiguration(version='3.8.1', arch="64", identifier='cp38-win_amd64'),
     ]
 
     if IS_RUNNING_ON_TRAVIS:
@@ -63,7 +63,7 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
         print('+ ' + ' '.join(args))
         args = ['cmd', '/E:ON', '/V:ON', '/C'] + args
         return subprocess.check_call(' '.join(args), env=env, cwd=cwd)
-    
+
     def download(url, dest):
         print('+ Download ' + url + ' to ' + dest)
         dest_dir = os.path.dirname(dest)
@@ -75,7 +75,7 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
                 response = urlopen(url)
             except:
                 if i == repeat_num - 1:
-                    raise 
+                    raise
                 sleep(3)
                 continue
             break
@@ -85,7 +85,7 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
                 file.write(response.read())
         finally:
             response.close()
-    
+
     if IS_RUNNING_ON_AZURE or IS_RUNNING_ON_TRAVIS:
         shell = simple_shell
     else: