diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6dfce6aa..3c8ebd4e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,9 +1,16 @@
 name: Test
 
-on: [push, pull_request]
+on:
+  push: {}
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
 
 jobs:
   test:
+    # skip branch builds on joerick/cibuildwheel, but always build `master` and pull requests
+    if: github.repository != 'joerick/cibuildwheel' || github.ref == 'refs/heads/master' || github.event_name == 'pull_request'
+
     name: Test cibuildwheel on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
diff --git a/.travis.yml b/.travis.yml
index 4ad0022c..4bda329c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,9 @@
 language: minimal
 
+branches:
+  only:
+  - master
+
 jobs:
   include:
     - name: Linux | x86_64 + i686 | Python 3.5
diff --git a/appveyor.yml b/appveyor.yml
index b3eaebc5..aa6cc154 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,3 +19,11 @@ install: python -m pip install --retries 3 -r requirements-dev.txt
 # the '-u' flag is required so the output is in the correct order.
 # See https://github.com/joerick/cibuildwheel/pull/24 for more info.
 test_script: python -u ./bin/run_tests.py
+
+branches:
+  only:
+    - master
+
+skip_commits:
+  files:
+    - docs/*