diff --git a/pkgs/development/libraries/haskell/glib/default.nix b/pkgs/development/libraries/haskell/glib/default.nix
index 29d2f92d7ba..4761c35127e 100644
--- a/pkgs/development/libraries/haskell/glib/default.nix
+++ b/pkgs/development/libraries/haskell/glib/default.nix
@@ -1,9 +1,10 @@
-{ cabal, glib, gtk2hsBuildtools, libc, pkgconfig }:
+{ cabal, glib, gtk2hsBuildtools, libc, pkgconfig, utf8String }:
 
 cabal.mkDerivation (self: {
   pname = "glib";
-  version = "0.12.4";
-  sha256 = "0s92phy1xlgjzqc7y5plviipb98m13h5lj4n9g6lbv4i106z97ax";
+  version = "0.12.5.0";
+  sha256 = "0s3gw4xd6d84hylzniy3sjjzz2ia2q4249vplhqn6y64dj96l196";
+  buildDepends = [ utf8String ];
   buildTools = [ gtk2hsBuildtools ];
   extraLibraries = [ libc pkgconfig ];
   pkgconfigDepends = [ glib ];