diff --git a/.github/workflows/build-majestic.yml b/.github/workflows/build-majestic.yml
index bc7b5e18c..11178c820 100644
--- a/.github/workflows/build-majestic.yml
+++ b/.github/workflows/build-majestic.yml
@@ -185,7 +185,7 @@ jobs:
     - name: Setup Haskell
       uses: haskell-actions/setup@v2
       with:
-        ghc-version: 8
+        ghc-version: 9
 
     - name: Build & run testsuite
       working-directory: ./src/runtime/haskell
@@ -197,8 +197,8 @@ jobs:
     runs-on: macOS-latest
     needs: macos-runtime
     env:
-      EXTRA_INCLUDE_DIRS: /usr/local/include
-      EXTRA_LIB_DIRS: /usr/local/lib
+      EXTRA_INCLUDE_DIRS: /opt/homebrew/include
+      EXTRA_LIB_DIRS: /opt/homebrew/lib
       MACOSX_DEPLOYMENT_TARGET: 11.0
   
     steps: