diff --git a/.github/workflows/dotnet-coverage.yml b/.github/workflows/dotnet-coverage.yml
index b813875..87f3d2d 100644
--- a/.github/workflows/dotnet-coverage.yml
+++ b/.github/workflows/dotnet-coverage.yml
@@ -35,6 +35,6 @@ jobs:
       - name: Test
         run: dotnet test --no-build --verbosity normal
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5.4.3
+        uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.github/workflows/snyk-code.yml b/.github/workflows/snyk-code.yml
index 06548e0..4c07b10 100644
--- a/.github/workflows/snyk-code.yml
+++ b/.github/workflows/snyk-code.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Restore dependencies
         run: dotnet restore algorithm_exercises_csharp.sln
       - name: Run Snyk to check for vulnerabilities
-        uses: snyk/actions/dotnet@master
+        uses: snyk/actions/dotnet@b98d498629f1c368650224d6d212bf7dfa89e4bf
         continue-on-error: true # To make sure that SARIF upload gets called
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
diff --git a/.github/workflows/sonarcloud.yml b/.github/workflows/sonarcloud.yml
index eb70b93..c933278 100644
--- a/.github/workflows/sonarcloud.yml
+++ b/.github/workflows/sonarcloud.yml
@@ -51,7 +51,7 @@ jobs:
         run: |
           .\.sonar\scanner\dotnet-sonarscanner begin `
           /k:"sir-gon_algorithm-exercises-csharp" `
-          /o:"sir-gon" /d:sonar.token="${{ secrets.SONAR_TOKEN }}" `
+          /o:"sir-gon" /d:sonar.token="${{ env.SONAR_TOKEN }}" `
           /d:sonar.host.url="https://sonarcloud.io" `
           /d:sonar.cs.opencover.reportsPaths=**/coverage.opencover.xml
 
@@ -59,4 +59,4 @@ jobs:
           dotnet build --no-restore
           dotnet test --no-build --verbosity normal
           .\.sonar\scanner\dotnet-sonarscanner end `
-          /d:sonar.token="${{ secrets.SONAR_TOKEN }}"
+          /d:sonar.token="${{ env.SONAR_TOKEN }}"