diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 441ae0e..27e303a 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -11,35 +11,21 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:
-          - ubuntu-latest
-          - macOS-latest
-          - windows-latest
+        os: [ubuntu-latest]
         cabal: ["3.10.1.0"]
         ghc:
           - 8.10.7
           - 9.0.2
           - 9.2.8
-          - 9.4.5
+          - 9.4.6
           - 9.6.2
-        exclude:
+        include:
           # Test only with latest GHC on windows and macOS
           - os: macOS-latest
-            ghc: 8.10.7
-          - os: macOS-latest
-            ghc: 9.0.2
-          - os: macOS-latest
-            ghc: 9.2.8
-          - os: macOS-latest
-            ghc: 9.4.5
-          - os: windows-latest
-            ghc: 8.10.7
+            ghc: 9.6.2
           - os: windows-latest
-            ghc: 9.0.2
-          - os: windows-latest
-            ghc: 9.2.8
-          - os: windows-latest
-            ghc: 9.4.5
+            ghc: 9.6.2
+
     steps:
       - uses: actions/checkout@v3
         if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
@@ -78,7 +64,7 @@ jobs:
     strategy:
       matrix:
         stack: [2.11.1]
-        ghc: [9.4.5]
+        ghc: [9.4.6]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/elm-street.cabal b/elm-street.cabal
index 752418d..e6ab51d 100644
--- a/elm-street.cabal
+++ b/elm-street.cabal
@@ -22,7 +22,7 @@ extra-source-files:  test/golden/oneType.json
 tested-with:         GHC == 8.10.7
                      GHC == 9.0.2
                      GHC == 9.2.8
-                     GHC == 9.4.5
+                     GHC == 9.4.6
                      GHC == 9.6.2
 
 source-repository head
diff --git a/stack.yaml b/stack.yaml
index bb875e4..8d9b815 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1 +1 @@
-resolver: lts-21.0
+resolver: lts-21.9