diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a0dc4043..3c497047 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,9 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        ghc: ['8.0', '8.2', '8.4', '8.6', '8.8', '8.10', '9.0', '9.2']
+        # At the moment haskell/actions/setup does not know much about GHC 9.4,
+        # so we have to specify the version in full.
+        ghc: ['8.0', '8.2', '8.4', '8.6', '8.8', '8.10', '9.0', '9.2', '9.4.1']
     steps:
 
     - uses: actions/checkout@v2