diff --git a/pkgs/development/libraries/haskell/mmorph/default.nix b/pkgs/development/libraries/haskell/mmorph/default.nix
index b2c3212bb17..4b3e687fd8f 100644
--- a/pkgs/development/libraries/haskell/mmorph/default.nix
+++ b/pkgs/development/libraries/haskell/mmorph/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "mmorph";
-  version = "1.0.2";
-  sha256 = "0d0nn5x7f3yyck10znqa13iihkshq04xgg1d9bn1nvl7kjzicjwh";
+  version = "1.0.3";
+  sha256 = "0b8pzb63zxw3cjw8yj73swvqhmi9c4lgw1mis1xbraya7flxc6qm";
   buildDepends = [ transformers ];
   meta = {
     description = "Monad morphisms";