diff --git a/.github/workflows/build-and-analyze-fork.yml b/.github/workflows/build-and-analyze-fork.yml
index 841dc77de..d59204376 100644
--- a/.github/workflows/build-and-analyze-fork.yml
+++ b/.github/workflows/build-and-analyze-fork.yml
@@ -10,12 +10,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             8.0.x
             3.1.x
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
 
@@ -31,7 +31,7 @@ jobs:
           reportgenerator -reports:TestResults/**/coverage.cobertura.xml -targetdir:TestResults/Output/CoverageReport -reporttypes:Cobertura
 
       - name: Archive code coverage results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: code-coverage-report
           path: TestResults/Output/CoverageReport/
@@ -48,7 +48,7 @@ jobs:
           name: code-coverage-report
           path: dist/
       - name: Create Coverage Summary Report
-        uses: irongut/CodeCoverageSummary@v1.3.0
+        uses: irongut/CodeCoverageSummary@51cc3a756ddcd398d447c044c02cb6aa83fdae95 # v1.3.0
         with:
           filename: dist/Cobertura.xml
           badge: true
diff --git a/.github/workflows/build-and-analyze.yml b/.github/workflows/build-and-analyze.yml
index 8659f8bf1..a8952f6bf 100644
--- a/.github/workflows/build-and-analyze.yml
+++ b/.github/workflows/build-and-analyze.yml
@@ -12,13 +12,13 @@ jobs:
     if: ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork == false) || github.event_name == 'push') && github.repository_owner == 'Altinn' && github.actor != 'dependabot[bot]' 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Set inotify watchers
         run: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
       - name: Set inotify instances
         run: echo fs.inotify.max_user_instances=8192 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             8.0.x
@@ -32,27 +32,27 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             8.0.x
       - name: Set up JDK 11
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           distribution: 'microsoft'
           java-version: 17
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Cache SonarCloud packages
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: ~\sonar\cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
       - name: Cache SonarCloud scanner
         id: cache-sonar-scanner
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: .\.sonar\scanner
           key: ${{ runner.os }}-sonar-scanner
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index bb73df89e..4ac07f63c 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -29,15 +29,15 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
     - name: Setup .NET 8.0.* SDK
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
       with:
         dotnet-version: |
           8.0.x
           3.1.x
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v3
+      uses: github/codeql-action/init@ebcb5b36ded6beda4ceefea6a8bc4cc885255bb3 # v3
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -45,7 +45,7 @@ jobs:
         # Prefix the list here with "+" to use these queries and those in the config file.
         # queries: ./path/to/local/query, your-org/your-repo/queries@main
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v3
+      uses: github/codeql-action/autobuild@ebcb5b36ded6beda4ceefea6a8bc4cc885255bb3 # v3
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v3
+      uses: github/codeql-action/analyze@ebcb5b36ded6beda4ceefea6a8bc4cc885255bb3 # v3
diff --git a/.github/workflows/container-scan.yml b/.github/workflows/container-scan.yml
index 24bd95605..48cd46842 100644
--- a/.github/workflows/container-scan.yml
+++ b/.github/workflows/container-scan.yml
@@ -18,11 +18,11 @@ jobs:
   scan:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
     - name: Build the Docker image
       run: docker build . --tag altinn-authorization:${{github.sha}}
 
-    - uses: Azure/container-scan@v0.1
+    - uses: Azure/container-scan@f9af925b897d8af5f7e0026b8bca9346261abc93 # v0.1
       with:
         image-name: altinn-authorization:${{ github.sha }}
       env:
diff --git a/.github/workflows/create-pnd-issues.yml b/.github/workflows/create-pnd-issues.yml
index 056dfa2df..1071c1d96 100644
--- a/.github/workflows/create-pnd-issues.yml
+++ b/.github/workflows/create-pnd-issues.yml
@@ -15,13 +15,13 @@ jobs:
       issues: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 20
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@fc06bc1257f339d1d5d8b3a19a8cae5388b55320 # v4
         with:
           version: 9
           run_install: |
@@ -31,7 +31,7 @@ jobs:
 
       - id: create
         name: Create issue
-        uses: JasonEtco/create-an-issue@v2
+        uses: JasonEtco/create-an-issue@1b14a70e4d8dc185e5cc76d3bec9eab20257b2c5 # v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
@@ -58,13 +58,13 @@ jobs:
       issues: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 20
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@fc06bc1257f339d1d5d8b3a19a8cae5388b55320 # v4
         with:
           version: 9
           run_install: |
@@ -74,7 +74,7 @@ jobs:
 
       - id: create
         name: Create issue
-        uses: JasonEtco/create-an-issue@v2
+        uses: JasonEtco/create-an-issue@1b14a70e4d8dc185e5cc76d3bec9eab20257b2c5 # v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
diff --git a/.github/workflows/infrastructure-template.yaml b/.github/workflows/infrastructure-template.yaml
index 66a75d7ca..484084aa3 100644
--- a/.github/workflows/infrastructure-template.yaml
+++ b/.github/workflows/infrastructure-template.yaml
@@ -28,7 +28,7 @@ jobs:
     environment: ${{ inputs.environment }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Terraform Set TFVARS
         run: echo "TF_VARS_FILE=$(echo ${{ inputs.environment }} | tr '[:upper:]' '[:lower:]').tfvars" >> $GITHUB_ENV
@@ -53,7 +53,7 @@ jobs:
     if: inputs.tf_should_apply
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Terraform Initialize
         uses: altinn/altinn-platform/actions/terraform/plan@main
diff --git a/.github/workflows/pep-dotnet-test.yml b/.github/workflows/pep-dotnet-test.yml
index 7971c2b2e..7be262341 100644
--- a/.github/workflows/pep-dotnet-test.yml
+++ b/.github/workflows/pep-dotnet-test.yml
@@ -21,12 +21,12 @@ jobs:
       DOTNET_HOSTBUILDER__RELOADCONFIGONCHANGE: false
     steps:
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             6.0.x
             5.0.x
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Build
diff --git a/.github/workflows/pep-test-and-analyze.yml b/.github/workflows/pep-test-and-analyze.yml
index c0dd03069..7e9f3f7ce 100644
--- a/.github/workflows/pep-test-and-analyze.yml
+++ b/.github/workflows/pep-test-and-analyze.yml
@@ -20,28 +20,28 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             6.0.x
             5.0.x
       - name: Set up JDK 11
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           distribution: 'zulu'
           java-version: 17
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Cache SonarCloud packages
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: ~\sonar\cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
       - name: Cache SonarCloud scanner
         id: cache-sonar-scanner
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: .\.sonar\scanner
           key: ${{ runner.os }}-sonar-scanner
diff --git a/.github/workflows/publish-abac-nuget.yml b/.github/workflows/publish-abac-nuget.yml
index 9a176a03d..581c519e7 100644
--- a/.github/workflows/publish-abac-nuget.yml
+++ b/.github/workflows/publish-abac-nuget.yml
@@ -10,12 +10,12 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/Altinn.Authorization.ABAC-')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             8.0.x
@@ -31,7 +31,7 @@ jobs:
           dotnet pack --configuration Release --no-build
 
       - name: Create artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: nuget package
           path: src/Altinn.Authorization.ABAC/bin/Release/*.nupkg
diff --git a/.github/workflows/publish-pep-nuget.yml b/.github/workflows/publish-pep-nuget.yml
index 3f5d7f042..5957df49d 100644
--- a/.github/workflows/publish-pep-nuget.yml
+++ b/.github/workflows/publish-pep-nuget.yml
@@ -10,12 +10,12 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/Altinn.Common.PEP-')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: |
             8.0.x
@@ -31,7 +31,7 @@ jobs:
           dotnet pack --configuration Release --no-build
 
       - name: Create artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: nuget package
           path: src/Altinn.Common.PEP/Altinn.Common.PEP/bin/Release/*.nupkg
diff --git a/Dockerfile b/Dockerfile
index b9f63e926..7757d0add 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine@sha256:5e2228a03bcb9b75b9078f7a2379c2c82639422b785601ff271f744745ac2f71 AS build
 WORKDIR Authorization/
 
 COPY src/Authorization ./Authorization
@@ -7,7 +7,7 @@ WORKDIR Authorization/
 RUN dotnet build Altinn.Platform.Authorization.csproj -c Release -o /app_output
 RUN dotnet publish Altinn.Platform.Authorization.csproj -c Release -o /app_output
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine AS final
+FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine@sha256:354c2fcfb3c23abc60d98f0380cdb403fba844a62a123b6343a8c9611209995c AS final
 EXPOSE 5050
 WORKDIR /app
 COPY --from=build /app_output .