diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 63682eb..81bbfa4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -64,7 +64,7 @@ jobs:
               run: cd docs && make html
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v3.1.0
 
       - name: Setup Python environment
         uses: ./.github/actions/setup-venv
@@ -96,7 +96,7 @@ jobs:
     needs: [checks]
     if: startsWith(github.ref, 'refs/tags/')
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3.1.0
 
       - name: Setup Python
         uses: actions/setup-python@v4
diff --git a/.github/workflows/pr_checks.yml b/.github/workflows/pr_checks.yml
index 7372c1f..ab825b1 100644
--- a/.github/workflows/pr_checks.yml
+++ b/.github/workflows/pr_checks.yml
@@ -18,7 +18,7 @@ jobs:
     if: github.event_name == 'pull_request'
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v3.1.0
 
     - name: Check that CHANGELOG has been updated
       run: |