diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 3de44abff..599e54cb1 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -53,7 +53,7 @@ jobs:
   instrumented-orchestrator-tests:
     name: "Instrumented Orchestrator Tests"
     timeout-minutes: 30
-    runs-on: macos-latest
+    runs-on: macOS-12
     steps:
       - name: "Checkout Branch"
         uses: actions/checkout@v3