diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 79ac248c..7cd7361c 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -1,6 +1,10 @@
 name: MyPy
 
-on: [push]
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
 
 jobs:
   build: