diff --git a/.github/workflows/anchore.yml b/.github/workflows/anchore.yml
index 802f626..a54fef9 100644
--- a/.github/workflows/anchore.yml
+++ b/.github/workflows/anchore.yml
@@ -35,20 +35,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
       - name: Build the Docker image
         run: docker build . --file ${{ env.DOCKERFILE }} --tag localbuild/testimage:latest
 
       - name: Run the Anchore scan action itself with GitHub Advanced Security code scanning integration enabled
-        uses: anchore/scan-action@v3
+        uses: anchore/scan-action@3343887d815d7b07465f6fdcd395bd66508d486a # v3
         with:
           image: "localbuild/testimage:latest"
           acs-report-enable: true
           fail-build: true
           severity-cutoff: "high"
       - name: Upload Anchore Scan Report
-        uses: github/codeql-action/upload-sarif@v2
+        uses: github/codeql-action/upload-sarif@4d85deb8548d03be541760228f3fe9e6a4d5d27d # v2
         if: always()
         with:
           sarif_file: results.sarif
diff --git a/.github/workflows/assignee.yml b/.github/workflows/assignee.yml
index 0611917..cf22668 100644
--- a/.github/workflows/assignee.yml
+++ b/.github/workflows/assignee.yml
@@ -21,6 +21,6 @@ jobs:
     steps:
       - name: Assign Me
         # You may pin to the exact commit or the version.
-        uses: kentaro-m/auto-assign-action@v1.2.1
+        uses: kentaro-m/auto-assign-action@746a3a558fdd0e061f612ec9f8ff1b8a19c1a115 # v1.2.1
         with:
           configuration-path: '.github/auto_assign.yml'
diff --git a/.github/workflows/check_metadata_pr.yml b/.github/workflows/check_metadata_pr.yml
index c687c53..5130b4a 100644
--- a/.github/workflows/check_metadata_pr.yml
+++ b/.github/workflows/check_metadata_pr.yml
@@ -21,7 +21,7 @@ jobs:
     steps:
 
       - name: Verify PR Labels
-        uses: jesusvasquez333/verify-pr-label-action@v1.4.0
+        uses: jesusvasquez333/verify-pr-label-action@657d111bbbe13e22bbd55870f1813c699bde1401 # v1.4.0
         with:
           github-token: '${{ secrets.GITHUB_TOKEN }}'
           valid-labels: 'bug, enhancement, breaking-change, ignore-for-release'
@@ -29,7 +29,7 @@ jobs:
 
       - name: Label Check
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'breaking-change') && !contains(github.event.pull_request.labels.*.name, 'enhancement') && !contains(github.event.pull_request.labels.*.name, 'bug') && !contains(github.event.pull_request.labels.*.name, 'ignore-for-release') }}
-        uses: actions/github-script@v3
+        uses: actions/github-script@ffc2c79a5b2490bd33e0a41c1de74b877714d736 # v3
         with:
           script: |
             core.setFailed('Missing required labels')
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 4f4091b..7fe85df 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -48,7 +48,7 @@ jobs:
         if: ${{ contains(github.event.pull_request.labels.*.name, 'ignore-for-release') }}
 
       - name: Azure Pipelines Action - Jversion
-        uses: jacopocarlini/azure-pipelines@v1.3
+        uses: jacopocarlini/azure-pipelines@b9721743a54e862597395b4a70727cfdc03028fb # v1.3
         with:
           azure-devops-project-url: https://dev.azure.com/pagopaspa/pagoPA-projects
           azure-pipeline-name: 'pagopa-function-template.deploy'
diff --git a/.github/workflows/sonar_analysis.yml b/.github/workflows/sonar_analysis.yml
index 8003cbf..6cc85f6 100644
--- a/.github/workflows/sonar_analysis.yml
+++ b/.github/workflows/sonar_analysis.yml
@@ -19,7 +19,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - name: Azure Pipelines Action - Jversion
-        uses: jacopocarlini/azure-pipelines@v1.3
+        uses: jacopocarlini/azure-pipelines@b9721743a54e862597395b4a70727cfdc03028fb # v1.3
         with:
           azure-devops-project-url: https://dev.azure.com/pagopaspa/pagoPA-projects
           azure-pipeline-name: 'pagopa-function-templat.code-review'
diff --git a/Dockerfile b/Dockerfile
index 0f0a3de..eb2847d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.2-fpm
+FROM php:8.2-fpm@sha256:44323764bd7ff0a64acf1e8d162315b5188e7917959eec1b8d5d7c726fad1558
 
 
 RUN apt -y update -y && apt -y upgrade && apt -y install git libpq-dev libzip-dev zip libmemcached-dev && docker-php-ext-configure pgsql -with-pgsql=/usr/local/pgsql && docker-php-ext-install pdo pdo_pgsql pgsql && docker-php-ext-install zip