diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4bcb99d..5c52e96 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: Setup .NET
       uses: prozolic/Actions/.github/actions/setup-dotnet@main
       with: