diff --git a/.github/workflows/code-checkers.yml b/.github/workflows/code-checkers.yml
index 1ac300e..c266d15 100644
--- a/.github/workflows/code-checkers.yml
+++ b/.github/workflows/code-checkers.yml
@@ -1,6 +1,10 @@
 name: Static code checkers
 
-on: [push]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
 
 permissions: {}
 
diff --git a/.github/workflows/requirements-check.yml b/.github/workflows/requirements-check.yml
index d96f05e..34b9ec1 100644
--- a/.github/workflows/requirements-check.yml
+++ b/.github/workflows/requirements-check.yml
@@ -1,6 +1,10 @@
 name: Check requirements file consistency
 
-on: [push]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
 
 permissions: {}
 
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
index 13711b2..acf9d82 100644
--- a/.github/workflows/zizmor.yml
+++ b/.github/workflows/zizmor.yml
@@ -1,6 +1,10 @@
 name: GitHub Actions Security Analysis with zizmor 🌈
 
-on: [push]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
 
 permissions: {}