diff --git a/.github/workflows/anchore.yml b/.github/workflows/anchore.yml
index 802f626..0c58b5a 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@563dcafdfe28a0bb82e2c272d84924f17b628540 # 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/create_dashboard.yaml b/.github/workflows/create_dashboard.yaml
index 9a91ef2..e131673 100644
--- a/.github/workflows/create_dashboard.yaml
+++ b/.github/workflows/create_dashboard.yaml
@@ -44,7 +44,7 @@ jobs:
           persist-credentials: false
 
       # from https://github.com/pagopa/opex-dashboard-azure-action/
-      - uses: pagopa/opex-dashboard-azure-action@v1.1.2
+      - uses: pagopa/opex-dashboard-azure-action@ece3bc2b133be74cabb50aec14cdb9b8051b886f # v1.1.2
         with:
           environment: ${{ matrix.environment }}
           api-name: ${{ matrix.product }}
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index c0b3f01..5d33e4c 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: 'projectName.deploy' # TODO: set the name
diff --git a/.github/workflows/sonar_analysis.yml b/.github/workflows/sonar_analysis.yml
index 3e0fad0..f820728 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: 'projectName.code-review' # TODO: set the name
diff --git a/.github/workflows/update_infra.yml b/.github/workflows/update_infra.yml
index dd6ad98..cafd8f9 100644
--- a/.github/workflows/update_infra.yml
+++ b/.github/workflows/update_infra.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
 
       # prepare openapi template for infra repo
       - run: |
diff --git a/Dockerfile b/Dockerfile
index 6f1142c..bbcc8df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,13 @@
 #
 # Build
 #
-FROM maven:3.8.4-jdk-11-slim as buildtime
+FROM maven:3.8.4-jdk-11-slim@sha256:04f8e5ba4a6a74fb7f97940bc75ac7340520728d2fb051ecc5c9ecbb9ba28b48 as buildtime
 WORKDIR /build
 COPY . .
 RUN mvn clean package
 
 
-FROM adoptopenjdk/openjdk11:alpine-jre as builder
+FROM adoptopenjdk/openjdk11:alpine-jre@sha256:bde3da4989dc3f8005755990565e9a1883d20ea16b025f6a66e022911c8d74a6 as builder
 COPY --from=buildtime /build/target/*.jar application.jar
 RUN java -Djarmode=layertools -jar application.jar extract
 
diff --git a/performance-test/docker-compose.yaml b/performance-test/docker-compose.yaml
index 0a56ebf..db92982 100644
--- a/performance-test/docker-compose.yaml
+++ b/performance-test/docker-compose.yaml
@@ -1,7 +1,7 @@
 version: '3.3'
 services:
   k6:
-    image: grafana/k6
+    image: grafana/k6@sha256:c70aaeaa1d9e4758ba5f292b1a0c73269fd949669c0d1042b2b1e18c58f07b82
     container_name: k6
     volumes:
       - '${PWD}/src:/scripts'
@@ -26,7 +26,7 @@ services:
       - nginx
 
   nginx:
-    image: nginx
+    image: nginx@sha256:05ab1728068284cbd42d54554fa2b69a3d6334adafccf2e70cf20925d7d55e90
     container_name: nginx
     volumes:
       - '${PWD}/nginx/nginx.conf:/etc/nginx/nginx.conf'