diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aeb469f..f5a3509 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,7 +54,7 @@ jobs:
         ./linux-container-ci.sh ${{ env.BUILDER_VERSION }} aws-crt-ubuntu-20-aarch64 build -p ${{ env.PACKAGE_NAME }} --target=linux-${{ matrix.arch }}
 
   linux-compiler-compat:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:
diff --git a/builder.json b/builder.json
index 79c8c91..dc6c2a7 100644
--- a/builder.json
+++ b/builder.json
@@ -89,6 +89,13 @@
 
     "variants": {
         "mono_test" : {
+            "hosts": {
+                "ubuntu": {
+                    "+packages": [
+                        "mono-runtime"
+                    ]
+                }
+            },
             "!test_steps": [
                 "dotnet build tests/tests.csproj -t:MonoTest {build_tests_args} --configuration Debug"
             ]