1 files changed, 3 insertions, 2 deletions
diff --git a/haddock.cabal b/haddock.cabal
index a24d3794..1993ead1 100644
--- a/haddock.cabal
+++ b/haddock.cabal
@@ -81,11 +81,12 @@ executable haddock
       xhtml >= 3000.2 && < 3000.3,
       ghc-boot,
       ghc-boot-th,
-      ghc == 9.0.*,
+      ghc == 9.1.*,
       bytestring,
       parsec,
       text,
-      transformers
+      transformers,
+      mtl
 
     other-modules:
       CompatPrelude