diff --git a/pkgs/development/libraries/haskell/irc/default.nix b/pkgs/development/libraries/haskell/irc/default.nix
index 89d277d1f40..524c2de1f73 100644
--- a/pkgs/development/libraries/haskell/irc/default.nix
+++ b/pkgs/development/libraries/haskell/irc/default.nix
@@ -1,10 +1,10 @@
-{ cabal, parsec }:
+{ cabal, attoparsec }:
 
 cabal.mkDerivation (self: {
   pname = "irc";
-  version = "0.5.1.0";
-  sha256 = "1xkgqcjxlxqg60qlv26ypmvf9x288sjz1n47rb7zfvjhdimws8gj";
-  buildDepends = [ parsec ];
+  version = "0.6.0.0";
+  sha256 = "037hpdb4b6nb5w62w34alwybchzybz0bq2cgp0mv4xlw7bks2nqv";
+  buildDepends = [ attoparsec ];
   meta = {
     description = "A small library for parsing IRC messages";
     license = self.stdenv.lib.licenses.bsd3;