diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 02384c9..05ab7e4 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
 
       - name: Dependency review
-        uses: actions/dependency-review-action@v1
\ No newline at end of file
+        uses: actions/dependency-review-action@a9c83d3af6b9031e20feba03b904645bb23d1dab # v1.0.2
\ No newline at end of file
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 188ac13..057d396 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@v2
+    - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
     - name: Shellcheck
       run: |
         .github/workflows/scripts/run-shellcheck.sh
diff --git a/.github/workflows/tf_plan.yml b/.github/workflows/tf_plan.yml
index 40678c8..83cd435 100644
--- a/.github/workflows/tf_plan.yml
+++ b/.github/workflows/tf_plan.yml
@@ -38,7 +38,7 @@ jobs:
           subscription-id: ${{ env.ARM_TF_STATE_SUBSCRIPTION_ID}}
 
       - name: Terraform plan
-        uses: cds-snc/terraform-plan@8986e57fae5b6758df6b977b9813b11622eac395 #v3.3.1
+        uses: cds-snc/terraform-plan@d79bcf0eccf632a0ad9e9193072b42c970766c5b # v3.3.1
         env:
           ARM_USE_OIDC: true
           RESOURCE_GROUP_NAME: ${{ env.AZURE_RESOURCES_RESOURCE_GROUP_NAME}}