diff --git a/.github/workflows/deploy-apidocs.yml b/.github/workflows/deploy-apidocs.yml
index 393adaf7c277..6160f5742f86 100644
--- a/.github/workflows/deploy-apidocs.yml
+++ b/.github/workflows/deploy-apidocs.yml
@@ -23,12 +23,12 @@ jobs:
           git config --global user.name "${GITHUB_ACTOR}"
 
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           path: source
 
       - name: Checkout target
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           repository: codeigniter4/api
           token: ${{ secrets.ACCESS_TOKEN }}
diff --git a/.github/workflows/deploy-framework.yml b/.github/workflows/deploy-framework.yml
index fff563878b2e..858e3b09b958 100644
--- a/.github/workflows/deploy-framework.yml
+++ b/.github/workflows/deploy-framework.yml
@@ -18,12 +18,12 @@ jobs:
           git config --global user.name "${GITHUB_ACTOR}"
 
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           path: source
 
       - name: Checkout target
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           repository: codeigniter4/framework
           token: ${{ secrets.ACCESS_TOKEN }}
@@ -63,12 +63,12 @@ jobs:
           git config --global user.name "${GITHUB_ACTOR}"
 
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           path: source
 
       - name: Checkout target
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           repository: codeigniter4/appstarter
           token: ${{ secrets.ACCESS_TOKEN }}
diff --git a/.github/workflows/deploy-userguide-latest.yml b/.github/workflows/deploy-userguide-latest.yml
index 22e6eed4db4f..a7cc3d9e2a88 100644
--- a/.github/workflows/deploy-userguide-latest.yml
+++ b/.github/workflows/deploy-userguide-latest.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       # Build the latest User Guide
       - name: Build with Sphinx
diff --git a/.github/workflows/test-phpstan.yml b/.github/workflows/test-phpstan.yml
index 86b68b058ea1..9bfc3ffe2dde 100644
--- a/.github/workflows/test-phpstan.yml
+++ b/.github/workflows/test-phpstan.yml
@@ -32,7 +32,7 @@ jobs:
         php-versions: ['7.4', '8.0']
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
diff --git a/.github/workflows/test-phpunit.yml b/.github/workflows/test-phpunit.yml
index fecd1d78b317..9e833d7f99b4 100644
--- a/.github/workflows/test-phpunit.yml
+++ b/.github/workflows/test-phpunit.yml
@@ -86,7 +86,7 @@ jobs:
         run: sqlcmd -S 127.0.0.1 -U sa -P 1Secure*Password1 -Q "CREATE DATABASE test"
 
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2
diff --git a/.github/workflows/test-rector.yml b/.github/workflows/test-rector.yml
index e1420c965f37..fd1b0115b93a 100644
--- a/.github/workflows/test-rector.yml
+++ b/.github/workflows/test-rector.yml
@@ -36,7 +36,7 @@ jobs:
         php-versions: ['7.4', '8.0']
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
diff --git a/.github/workflows/test-userguide.yml b/.github/workflows/test-userguide.yml
index a1a1a25508a3..cbaed7e2dae9 100644
--- a/.github/workflows/test-userguide.yml
+++ b/.github/workflows/test-userguide.yml
@@ -17,7 +17,7 @@ jobs:
     name: Check User Guide syntax
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: ammaraskar/sphinx-action@0.4
         with:
           docs-folder: user_guide_src