diff --git a/pkgs/development/libraries/haskell/mmorph/default.nix b/pkgs/development/libraries/haskell/mmorph/default.nix
index c4379499fad9..702aca476fd0 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 = "1.0.0";
-  sha256 = "10r8frcn6ar56n1vxy8rkys8j52f8xkqan8qxqanka1150k6khqk";
+  version = "1.0.1";
+  sha256 = "15a4isvxb4my72hzndgfy66792r9fpkn9vnmr2fnv9d9vl058y14";
   buildDepends = [ transformers ];
   meta = {
     description = "Monad morphisms";