diff --git a/pkgs/applications/science/logic/lean2/default.nix b/pkgs/applications/science/logic/lean2/default.nix
index a938af72f587..f45f65e90826 100644
--- a/pkgs/applications/science/logic/lean2/default.nix
+++ b/pkgs/applications/science/logic/lean2/default.nix
@@ -3,13 +3,13 @@
 
 stdenv.mkDerivation rec {
   name = "lean2-${version}";
-  version = "2016-11-29";
+  version = "2017-07-22";
 
   src = fetchFromGitHub {
     owner  = "leanprover";
     repo   = "lean2";
-    rev    = "a086fb334838c427bbc8f984eb44a4cbbe013a6b";
-    sha256 = "0qlvhnb37amclgcyizl8bfab33b0a3jk54br9gsrik8cq76lkwwx";
+    rev    = "34dbd6c3ae612186b8f0f80d12fbf5ae7a059ec9";
+    sha256 = "1xv3j487zhh1zf2b4v19xzw63s2sgjhg8d62a0kxxyknfmdf3khl";
   };
 
   buildInputs = [ gmp mpfr cmake python gperftools ninja makeWrapper ];