diff --git a/.github/workflows/on-demand-verification.yml b/.github/workflows/on-demand-verification.yml
index ce6efe4..81fc990 100644
--- a/.github/workflows/on-demand-verification.yml
+++ b/.github/workflows/on-demand-verification.yml
@@ -40,7 +40,7 @@ jobs:
     steps:
 
       - name: Checkout opencl-clang sources for action files availabilty
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Run build-opencl-clang action
         uses: ./.github/actions/build-opencl-clang
diff --git a/.github/workflows/on-push-verification.yml b/.github/workflows/on-push-verification.yml
index d744560..f1ecbc4 100644
--- a/.github/workflows/on-push-verification.yml
+++ b/.github/workflows/on-push-verification.yml
@@ -35,7 +35,7 @@ jobs:
     steps:
 
       - name: Checkout opencl-clang sources for action files
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Run build-opencl-clang action
         uses: ./.github/actions/build-opencl-clang
diff --git a/.github/workflows/scheduled-verification.yml b/.github/workflows/scheduled-verification.yml
index e13b5fd..9d6e694 100644
--- a/.github/workflows/scheduled-verification.yml
+++ b/.github/workflows/scheduled-verification.yml
@@ -21,7 +21,7 @@ jobs:
     steps:
 
       - name: Checkout opencl-clang sources for action files availabilty
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Run build-opencl-clang action
         uses: ./.github/actions/build-opencl-clang
@@ -39,7 +39,7 @@ jobs:
     steps:
 
       - name: Checkout opencl-clang sources for action files availabilty
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Run build-opencl-clang action
         uses: ./.github/actions/build-opencl-clang