diff --git a/pkgs/applications/science/logic/hol_light/default.nix b/pkgs/applications/science/logic/hol_light/default.nix
index ac048c2dc9be..01746a748fe4 100644
--- a/pkgs/applications/science/logic/hol_light/default.nix
+++ b/pkgs/applications/science/logic/hol_light/default.nix
@@ -9,11 +9,11 @@ let
 in
 
 stdenv.mkDerivation {
-  name = "hol_light-20120312";
+  name = "hol_light-20120427";
   src = fetchsvn {
     url = http://hol-light.googlecode.com/svn/trunk;
-    rev = "128";
-    sha256 = "35dc164c05b07663bf596ea9553209087c1538dea87a04c23f01d5423b23dbfe";
+    rev = "134";
+    sha256 = "91e7575eeac37a1fbd127eabe99f736b9e1a19fb7b1a0fa27cf31b66edad4b17";
   };
 
   buildInputs = [ ocaml findlib camlp5 ];