diff --git a/.github/workflows/macos_build.yml b/.github/workflows/macos_build.yml
index 5c860d1d..70672ed9 100644
--- a/.github/workflows/macos_build.yml
+++ b/.github/workflows/macos_build.yml
@@ -1,5 +1,8 @@
 name: macos_build
-on: [pull_request, push]
+on:
+  push:
+    branches: [master]
+  pull_request: {}
 
 permissions:
   contents: read  #  to fetch code (actions/checkout)
diff --git a/.github/workflows/pyenv_tests.yml b/.github/workflows/pyenv_tests.yml
index f6575f0f..cf3e343b 100644
--- a/.github/workflows/pyenv_tests.yml
+++ b/.github/workflows/pyenv_tests.yml
@@ -1,5 +1,8 @@
 name: pyenv_tests
-on: [pull_request, push]
+on:
+  push:
+    branches: [master]
+  pull_request: {}
 
 permissions:
   contents: read  #  to fetch code (actions/checkout)
diff --git a/.github/workflows/ubuntu_build.yml b/.github/workflows/ubuntu_build.yml
index 9ba4513d..7c496c3e 100644
--- a/.github/workflows/ubuntu_build.yml
+++ b/.github/workflows/ubuntu_build.yml
@@ -1,5 +1,8 @@
 name: ubuntu_build
-on: [pull_request, push]
+on:
+  push:
+    branches: [master]
+  pull_request: {}
 
 permissions:
   contents: read  #  to fetch code (actions/checkout)