diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b204551..b982f5c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,7 +28,7 @@ jobs:
 
       - uses: actions/setup-dotnet@v6
         with:
-          dotnet-version: '8.0.x'
+          dotnet-version: '8.0.427'
 
       - name: Cache NuGet packages
         uses: actions/cache@v5
diff --git a/.github/workflows/recomp-test.yml b/.github/workflows/recomp-test.yml
index 6ae6eb8..f222a84 100644
--- a/.github/workflows/recomp-test.yml
+++ b/.github/workflows/recomp-test.yml
@@ -20,7 +20,7 @@ jobs:
 
       - uses: actions/setup-dotnet@v6
         with:
-          dotnet-version: '8.0.x'
+          dotnet-version: '8.0.427'
 
       # Cache downloads only. Preparation still validates pins, and every run
       # compiles current Aurora, runtime, and generated sources from scratch.