diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index 69a05386..06cdadbd 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -1,13 +1,16 @@
 # https://pre-commit.com
 # This GitHub Action assumes that the repo contains a valid .pre-commit-config.yaml file.
 name: pre-commit
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+    branches: [master]
 jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
-      - uses: actions/setup-python@master
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
       - run: pip install pre-commit
       - run: pre-commit --version
       - run: pre-commit install