diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index 2d02bb20bed..2629c2f65e7 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         # If you edit these versions, make sure the version in the lonely macos-latest job below is updated accordingly
-        ghc: ["9.2.8", "9.6.3"]
+        ghc: ["9.6.4"]
         cabal: ["3.10.2.1"]
         os: [windows-latest, ubuntu-latest]
         include:
@@ -34,11 +34,11 @@ jobs:
           # We want a single job, because macOS runners are scarce.
           - os: macos-latest
             cabal: "3.10.2.1"
-            ghc: "9.6.3"
+            ghc: "9.6.4"
 
     env:
       # Modify this value to "invalidate" the cabal cache.
-      CABAL_CACHE_VERSION: "2024-01-19"
+      CABAL_CACHE_VERSION: "2024-01-24"
 
     concurrency:
       group: >