diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 5451c5a..4fc2d23 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -18,7 +18,7 @@ jobs:
         reaction: eyes
       env:
         GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
       if: steps.check.outputs.triggered == 'true'
       with:
         submodules: 'recursive'
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5dfe554..c2daa2d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -19,7 +19,7 @@ jobs:
         python-version: [3.8]
         compiler: [gcc, clang]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
       with:
         submodules: 'recursive'
     - name: Set release name env variable (ubuntu)
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index af2e117..3c0cb31 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,7 +9,7 @@ jobs:
     name: Build and publish Python 🐍 distributions 📦 to TestPyPI
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
       with:
         submodules: 'recursive'
     - name: Set up Python 3.8