diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,7 +1,10 @@
+# 1.1.0.1
+
+* GHC 9 support.
+
 # 1.1.0.0
 
 * Port to fused-effects 1.1.
-
 
 # 1.0.0.0
 
diff --git a/fused-effects-exceptions.cabal b/fused-effects-exceptions.cabal
--- a/fused-effects-exceptions.cabal
+++ b/fused-effects-exceptions.cabal
@@ -1,7 +1,7 @@
 cabal-version:       2.4
 
 name:                fused-effects-exceptions
-version:             1.1.0.0
+version:             1.1.0.1
 synopsis:            Handle exceptions thrown in IO with fused-effects.
 description:         Provides Resource and Catch effects capable of reacting to and catching GHC's dynamic exceptions.
 homepage:            https://github.com/fused-effects/fused-effects-exceptions#readme
@@ -22,6 +22,7 @@
   GHC == 8.6.5
   GHC == 8.8.3
   GHC == 8.10.1
+  GHC == 9.0.1
 
 common common
   default-language: Haskell2010
diff --git a/src/Control/Effect/Exception.hs b/src/Control/Effect/Exception.hs
--- a/src/Control/Effect/Exception.hs
+++ b/src/Control/Effect/Exception.hs
@@ -166,7 +166,7 @@
 --
 -- @since 1.0.0.0
 mask_ :: Has (Lift IO) sig m => m a -> m a
-mask_ m = mask $ const m
+mask_ m = mask (\_ -> m)
 
 -- | See @"Control.Exception".'Exc.uninterruptibleMask'@.
 --
@@ -179,7 +179,7 @@
 --
 -- @since 1.0.0.0
 uninterruptibleMask_ :: Has (Lift IO) sig m => m a -> m a
-uninterruptibleMask_ m = uninterruptibleMask $ const m
+uninterruptibleMask_ m = uninterruptibleMask (\_ -> m)
 
 -- | See @"Control.Exception".'Exc.getMaskingState'@.
 --