diff --git a/.github/workflows/stack-based-build.yaml b/.github/workflows/stack-based-build.yaml
index 5795349..ddccd08 100755
--- a/.github/workflows/stack-based-build.yaml
+++ b/.github/workflows/stack-based-build.yaml
@@ -1,21 +1,23 @@
 name: Build and run tests
+
 on:
+  pull_request:
+    branches: [ main ]
   push:
-  # pull_request: # Don't run twice
+    branches: [ main ]
+
 jobs:
   flakes-simple:
     strategy:
       matrix:
-        os: [ubuntu-22.04, macos-14, macos-13]
+        os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+
       - uses: haskell-actions/setup@v2
         with:
           enable-stack: true
-          ghc-version: '9.10.1'
-          cabal-version: '3.10.3.0'
-          stack-version: '2.15.7'
 
       - uses: actions/cache@v4
         name: Cache ~/.stack