diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 5f766cea..d77a2fbf 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -8,7 +8,7 @@ jobs:
   shellcheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
     - name: Shellcheck
       run: |
         .github/workflows/scripts/run-shellcheck.sh
diff --git a/.github/workflows/tf-apply.yml b/.github/workflows/tf-apply.yml
index 80f7da6d..da90b17c 100644
--- a/.github/workflows/tf-apply.yml
+++ b/.github/workflows/tf-apply.yml
@@ -112,7 +112,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: setup terraform tools
         uses: cds-snc/terraform-tools-setup@v1
diff --git a/.github/workflows/tf-drift-check.yml b/.github/workflows/tf-drift-check.yml
index 79127dfa..6049caee 100644
--- a/.github/workflows/tf-drift-check.yml
+++ b/.github/workflows/tf-drift-check.yml
@@ -96,7 +96,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Setup Terraform tools
         uses: cds-snc/terraform-tools-setup@v1
diff --git a/.github/workflows/tf-plan-aft.yml b/.github/workflows/tf-plan-aft.yml
index 7859f46a..d047ceca 100644
--- a/.github/workflows/tf-plan-aft.yml
+++ b/.github/workflows/tf-plan-aft.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: setup terraform tools
         uses: cds-snc/terraform-tools-setup@v1
diff --git a/.github/workflows/tf-plan-org.yml b/.github/workflows/tf-plan-org.yml
index 102b1937..78260aca 100644
--- a/.github/workflows/tf-plan-org.yml
+++ b/.github/workflows/tf-plan-org.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: setup terraform tools
         uses: cds-snc/terraform-tools-setup@v1
diff --git a/.github/workflows/tf-plan.yml b/.github/workflows/tf-plan.yml
index 13f528b5..bef31c90 100644
--- a/.github/workflows/tf-plan.yml
+++ b/.github/workflows/tf-plan.yml
@@ -107,7 +107,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: setup terraform tools
         uses: cds-snc/terraform-tools-setup@v1