diff --git a/pkgs/development/libraries/haskell/mime-mail/default.nix b/pkgs/development/libraries/haskell/mime-mail/default.nix
index 7651d36aca8..1b3f3c30a14 100644
--- a/pkgs/development/libraries/haskell/mime-mail/default.nix
+++ b/pkgs/development/libraries/haskell/mime-mail/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "mime-mail";
-  version = "0.3.0.3";
-  sha256 = "0aag2mj1jchgwgnlh6hmv9qz78qjxffn1b52nwl6257sk0qv6va6";
+  version = "0.4";
+  sha256 = "0hlyk3mypn9iw7g8hhn528ycbm3qayiczwf4paw0sxd6xsg9a28s";
   buildDepends = [ blazeBuilder dataenc random text ];
   meta = {
     homepage = "http://github.com/snoyberg/mime-mail";