diff --git a/.github/workflows/check_links.yml b/.github/workflows/check_links.yml
index 70533890..58b7b673 100644
--- a/.github/workflows/check_links.yml
+++ b/.github/workflows/check_links.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
 
       - name: Install Python and just
         uses: opensafely-core/setup-action@v1
diff --git a/.github/workflows/check_redirects.yml b/.github/workflows/check_redirects.yml
index 4017359d..35830be6 100644
--- a/.github/workflows/check_redirects.yml
+++ b/.github/workflows/check_redirects.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
 
       - name: Check Cloudflare redirects
         run: |
diff --git a/.github/workflows/check_vale.yml b/.github/workflows/check_vale.yml
index 8b9b6160..127817de 100644
--- a/.github/workflows/check_vale.yml
+++ b/.github/workflows/check_vale.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
 
       - name: Install just
         uses: opensafely-core/setup-action@v1
diff --git a/.github/workflows/pages-deployment.yml b/.github/workflows/pages-deployment.yml
index 06286899..0ea26d23 100644
--- a/.github/workflows/pages-deployment.yml
+++ b/.github/workflows/pages-deployment.yml
@@ -18,7 +18,7 @@ jobs:
     name: Deploy to Cloudflare Pages
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
 
       - name: Install Python and just
         uses: opensafely-core/setup-action@v1