diff --git a/pkgs/development/libraries/haskell/semigroups/default.nix b/pkgs/development/libraries/haskell/semigroups/default.nix
index 795c690d7a2..240062493e3 100644
--- a/pkgs/development/libraries/haskell/semigroups/default.nix
+++ b/pkgs/development/libraries/haskell/semigroups/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "semigroups";
-  version = "0.8.4";
-  sha256 = "0xphwxxzddgcw2hr4h60l3y27f1x032w049wkjs71f5hdypwapv4";
+  version = "0.8.4.1";
+  sha256 = "05wv5amgg3nqr1if936zl330sv1k4i9p8xzdmgxsmchp4lshyr6n";
   meta = {
     homepage = "http://github.com/ekmett/semigroups/";
     description = "Haskell 98 semigroups";