diff --git a/pkgs/development/libraries/haskell/semigroups/default.nix b/pkgs/development/libraries/haskell/semigroups/default.nix
index dbdce2eabe51..1a1234413aaa 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 = "0.9";
-  sha256 = "0cwyjjlr9zgpxryzdf26pb58dmad0cp8d0493rarhh5zmgighh90";
+  version = "0.9.1";
+  sha256 = "1i49180fw9bxnszmqc5jl877kjhkaa22py1jwfh69slx4z3giyxq";
   buildDepends = [ nats ];
   meta = {
     homepage = "http://github.com/ekmett/semigroups/";