diff --git a/.github/workflows/ci.dhall b/.github/workflows/ci.dhall
index 169604f..2e98d45 100644
--- a/.github/workflows/ci.dhall
+++ b/.github/workflows/ci.dhall
@@ -5,7 +5,6 @@ in    haskellCi.generalCi
         ( Some
             { ghc =
               [ haskellCi.GHC.GHC8104
-              , haskellCi.GHC.GHC901
               , haskellCi.GHC.GHC884
               , haskellCi.GHC.GHC865
               ]
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7146799..4357cb1 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -29,7 +29,6 @@ jobs:
           - '3.2'
         ghc:
           - '8.10.4'
-          - '9.0.1'
           - '8.8.4'
           - '8.6.5'
 name: Haskell CI