diff --git a/pkgs/development/libraries/haskell/async/default.nix b/pkgs/development/libraries/haskell/async/default.nix
index d66ab5e8658..15cef9b35f1 100644
--- a/pkgs/development/libraries/haskell/async/default.nix
+++ b/pkgs/development/libraries/haskell/async/default.nix
@@ -1,12 +1,13 @@
-{ cabal }:
+{ cabal, stm }:
 
 cabal.mkDerivation (self: {
   pname = "async";
-  version = "1.4";
-  sha256 = "1d24bcvmw687jcf75wgavlhfs55f0va02xhl4xdnj2lrlr19s5dl";
+  version = "2.0.0.0";
+  sha256 = "03aqgfgpar53k7bzb3s988a4fg0pzy7jmjv299wz2hxl7vr6fzkr";
+  buildDepends = [ stm ];
   meta = {
-    homepage = "http://gitorious.org/async/";
-    description = "Asynchronous Computations";
+    homepage = "https://github.com/simonmar/async";
+    description = "Run IO operations asynchronously and wait for their results";
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
     maintainers = [ self.stdenv.lib.maintainers.andres ];