diff --git a/pkgs/development/libraries/haskell/conduit/default.nix b/pkgs/development/libraries/haskell/conduit/default.nix
index 8614b24bacc..8bfb77a8706 100644
--- a/pkgs/development/libraries/haskell/conduit/default.nix
+++ b/pkgs/development/libraries/haskell/conduit/default.nix
@@ -1,13 +1,13 @@
-{ cabal, doctest, hspec, liftedBase, monadControl, QuickCheck
-, resourcet, text, transformers, transformersBase, void
+{ cabal, doctest, hspec, liftedBase, mmorph, monadControl
+, QuickCheck, resourcet, text, transformers, transformersBase, void
 }:
 
 cabal.mkDerivation (self: {
   pname = "conduit";
-  version = "1.0.3";
-  sha256 = "1jvbm5v25h1m5a9gd0f417mhpabp3kcfzsjm8887gcyimp2d0z07";
+  version = "1.0.4";
+  sha256 = "1y97wc273i3qvq4nqp9kr3bgl8mca257hv92f3lbq2wzqkr5vahk";
   buildDepends = [
-    liftedBase monadControl resourcet text transformers
+    liftedBase mmorph monadControl resourcet text transformers
     transformersBase void
   ];
   testDepends = [