diff --git a/pkgs/development/libraries/haskell/uulib/default.nix b/pkgs/development/libraries/haskell/uulib/default.nix
index 2514da38ad7..9b29afb1557 100644
--- a/pkgs/development/libraries/haskell/uulib/default.nix
+++ b/pkgs/development/libraries/haskell/uulib/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self : {
   pname = "uulib";
-  version = "0.9.11";
-  sha256 = "f364ec14f249c9fc28ab341050c7e1cc1bde865fb787e4456c07c1df450815c8";
+  version = "0.9.12";
+  sha256 = "e2ea76db10e5ce94cf6282642754d0e65e5abadc620b3827aa2ab497b88e6747";
   meta = {
     description = "Haskell Utecht Tools Library";
   };