diff --git a/pkgs/development/libraries/haskell/irc/default.nix b/pkgs/development/libraries/haskell/irc/default.nix
index be3818cb7d8..c7e222e1d14 100644
--- a/pkgs/development/libraries/haskell/irc/default.nix
+++ b/pkgs/development/libraries/haskell/irc/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "irc";
-  version = "0.4.4.2";
-  sha256 = "1bbxlmb6jzz0zw18nr3d6lgd83vi9hrjahfcf1dswc946wi31s97";
+  version = "0.5.0.0";
+  sha256 = "0bid9iqgrppkl7hl1cd2m1pvvk5qva53fqfl0v5ld52j904c50sr";
   buildDepends = [ parsec ];
   meta = {
     description = "A small library for parsing IRC messages";