diff --git a/pkgs/development/compilers/urweb/default.nix b/pkgs/development/compilers/urweb/default.nix
index dc862940edf..3e4b0bcae5b 100644
--- a/pkgs/development/compilers/urweb/default.nix
+++ b/pkgs/development/compilers/urweb/default.nix
@@ -4,11 +4,11 @@
 
 stdenv.mkDerivation rec {
   name = "urweb-${version}";
-  version = "20150819";
+  version = "20151018";
 
   src = fetchurl {
     url = "http://www.impredicative.com/ur/${name}.tgz";
-    sha256 = "0gpdlq3aazx121k3ia94qfa4dyv04q7478x2p6hvcjamn18vk56n";
+    sha256 = "08p52p5m1xl2gzdchnayky44mm2b0x8hv0f00iviyyv1gnx3lpy0";
   };
 
   buildInputs = [ openssl mlton mysql postgresql sqlite ];