diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index dede64c9..f42ea097 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -26,6 +26,8 @@ jobs:
     strategy:
       matrix:
         include:
+          - compiler: ghc-9.0.1
+            allow-failure: false
           - compiler: ghc-8.10.3
             allow-failure: false
           - compiler: ghc-8.8.4
diff --git a/xmonad-contrib.cabal b/xmonad-contrib.cabal
index 77fc6302..d2e82bfd 100644
--- a/xmonad-contrib.cabal
+++ b/xmonad-contrib.cabal
@@ -31,7 +31,7 @@ cabal-version:      >= 1.8
 build-type:         Simple
 bug-reports:        https://github.com/xmonad/xmonad-contrib/issues
 
-tested-with:        GHC == 8.4.4 || == 8.6.5 || == 8.8.4 || == 8.10.3
+tested-with:        GHC == 8.4.4 || == 8.6.5 || == 8.8.4 || == 8.10.3 || == 9.0.1
 
 source-repository head
   type:     git