diff --git a/bindings/haskell/keystone.cabal b/bindings/haskell/keystone.cabal
index afffb3a0f65901ed7e53ae9d6f71881a5820c8b2..57eb61f1decf508e223d28f7849540535d17da49 100644
--- a/bindings/haskell/keystone.cabal
+++ b/bindings/haskell/keystone.cabal
@@ -27,7 +27,7 @@ library
   other-modules:       Keystone.Internal.Util
   build-depends:       base >= 4 && < 5,
                        bytestring >= 0.9.1,
-                       transformers <= 0.5,
+                       transformers < 0.6,
                        either >= 4.4
   hs-source-dirs:      src
   c-sources:           src/cbits/keystone_wrapper.c