diff --git a/pkgs/development/libraries/haskell/dimensional/default.nix b/pkgs/development/libraries/haskell/dimensional/default.nix
index 1f672c25cfa..512ea378b66 100644
--- a/pkgs/development/libraries/haskell/dimensional/default.nix
+++ b/pkgs/development/libraries/haskell/dimensional/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "dimensional";
-  version = "0.12.1.1";
-  sha256 = "1fjkvyp62bh5gyzhkn189z5mxrr1acwmk39mqxk4579xbchvpyq6";
+  version = "0.12.2";
+  sha256 = "0b5w9g3xn74b7z4bcsfcijnj54r8cwbbd8129q61c3nhng1f896a";
   buildDepends = [ numtype time ];
   meta = {
     homepage = "http://dimensional.googlecode.com/";