diff --git a/.github/workflows/RunTests-macOS.yml b/.github/workflows/RunTests-macOS.yml
index bf47378..cb2c0be 100644
--- a/.github/workflows/RunTests-macOS.yml
+++ b/.github/workflows/RunTests-macOS.yml
@@ -5,11 +5,11 @@ on: [pull_request]
 jobs:
   build:
 
-    runs-on: macOS-latest
+    runs-on: macos-13
     
     steps:
     - uses: actions/checkout@v1
     - name: Select Xcode 15 beta
-      run: sudo xcode-select -s /Applications/Xcode_15.app
+      run: sudo xcode-select -s /Applications/Xcode_15.0.app
     - name: Run tests
       run: swift test