diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b9b0baf..1be2bce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
       matrix:
         node-version: [18.x]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
 
       - name: Use Node.js
         uses: actions/setup-node@v3
diff --git a/.github/workflows/platformatic-deploy.yml b/.github/workflows/platformatic-deploy.yml
index 6ffb035..25777bf 100644
--- a/.github/workflows/platformatic-deploy.yml
+++ b/.github/workflows/platformatic-deploy.yml
@@ -16,7 +16,7 @@ jobs:
       name: main
     steps:
       - name: Checkout application project repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: npm install --omit=dev
         run: npm install --omit=dev
       - name: Deploy project
diff --git a/.github/workflows/platformatic-preview.yml b/.github/workflows/platformatic-preview.yml
index 143c25a..b9b6510 100644
--- a/.github/workflows/platformatic-preview.yml
+++ b/.github/workflows/platformatic-preview.yml
@@ -17,7 +17,7 @@ jobs:
       name: development
     steps:
       - name: Checkout application project repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: npm install --omit=dev
         run: npm install --omit=dev
       - name: Get PR number