diff --git a/.github/workflows/aarch64.yml b/.github/workflows/aarch64.yml
index 491afbcbd10a..8e99d970c275 100644
--- a/.github/workflows/aarch64.yml
+++ b/.github/workflows/aarch64.yml
@@ -1,6 +1,12 @@
 name: AArch64 CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   musl-build:
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 2d36da97594c..e676c7c42db7 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -1,6 +1,12 @@
 name: Linux CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 env:
   TRAVIS_OS_NAME: linux
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 0f10ac993bc4..1542007ac42b 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -1,6 +1,12 @@
 name: macOS CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 env:
   SPEC_SPLIT_DOTS: 160
diff --git a/.github/workflows/win.yml b/.github/workflows/win.yml
index a2841f017b55..e35a64bd2e27 100644
--- a/.github/workflows/win.yml
+++ b/.github/workflows/win.yml
@@ -1,6 +1,12 @@
 name: Windows CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   linux-job: