diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 8d84b6a..2491920 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -17,7 +17,7 @@ jobs:
       tag_format: ${{ steps.load-config.outputs.TAG_FORMAT }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
 
       - name: Get asdf version
         id: asdf-version
diff --git a/.github/workflows/quality-checks.yml b/.github/workflows/quality-checks.yml
index d9db5e4..bed95c2 100644
--- a/.github/workflows/quality-checks.yml
+++ b/.github/workflows/quality-checks.yml
@@ -28,14 +28,14 @@ jobs:
   quality_checks:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/setup-java@v5
+      - uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165
         if: ${{ inputs.install_java }}
         with:
           java-version: "21"
           distribution: "corretto"
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         with:
           ref: ${{ env.BRANCH_NAME }}
           fetch-depth: 0
@@ -79,7 +79,7 @@ jobs:
           asdf_version: ${{ inputs.asdfVersion }}
 
       - name: Cache asdf
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830
         with:
           path: |
             ~/.asdf
@@ -196,10 +196,10 @@ jobs:
         run: make lint
 
       - name: actionlint
-        uses: raven-actions/actionlint@v2
+        uses: raven-actions/actionlint@3a24062651993d40fed1019b58ac6fbdfbf276cc
 
       - name: Run ShellCheck
-        uses: ludeeus/action-shellcheck@master
+        uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38
         with:
           ignore_paths: >-
             *test*
@@ -302,9 +302,9 @@ jobs:
           done
 
       - name: Download terraform plans
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53
         with:
-          pattern: '*_terraform_plan'
+          pattern: "*_terraform_plan"
           path: terraform_plans/
           merge-multiple: true
 
@@ -319,7 +319,7 @@ jobs:
             ls -l terraform_plans/
             echo "terraform_plans_exist=true" >> "$GITHUB_OUTPUT"
           fi
-      
+
       - name: Run cfn-guard script for terraform plans
         if: steps.check_terraform_plans.outputs.terraform_plans_exist == 'true'
         run: |
@@ -343,13 +343,13 @@ jobs:
 
       - name: Upload cfn_guard_output
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4
         with:
           name: cfn_guard_output
           path: cfn_guard_output
 
       - name: Generate and check SBOMs
-        uses: NHSDigital/eps-action-sbom@main
+        uses: NHSDigital/eps-action-sbom@efc65411a5d69d617c9ba15d633a18f7b9896859
 
       - name: "check is SONAR_TOKEN exists"
         env:
@@ -362,7 +362,7 @@ jobs:
         run: mvn sonar:sonar -Dsonar.login=${{ secrets.SONAR_TOKEN }}
 
       - name: SonarCloud Scan
-        uses: SonarSource/sonarqube-scan-action@master
+        uses: SonarSource/sonarqube-scan-action@fd88b7d7ccbaefd23d8f36f73b59db7a3d246602
         if: ${{ steps.check_java.outputs.uses_java == 'false' && env.SONAR_TOKEN_EXISTS == 'true' }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6047db5..98b5e96 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,7 +15,7 @@ jobs:
       tag_format: ${{ steps.load-config.outputs.TAG_FORMAT }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
 
       - name: Get asdf version
         id: asdf-version