diff --git a/pkgs/applications/science/logic/alt-ergo/default.nix b/pkgs/applications/science/logic/alt-ergo/default.nix
index ca1602d6e58..3bbcda9de11 100644
--- a/pkgs/applications/science/logic/alt-ergo/default.nix
+++ b/pkgs/applications/science/logic/alt-ergo/default.nix
@@ -2,12 +2,12 @@
 
 stdenv.mkDerivation rec {
   name = "alt-ergo-${version}";
-  version = "0.95.2";
+  version = "0.99.1";
 
   src = fetchurl {
     url    = "http://alt-ergo.ocamlpro.com/download_manager.php?target=${name}.tar.gz";
     name   = "${name}.tar.gz";
-    sha256 = "1b7f0rh3jgm67g0x2m3wv7gnnqmz9cjlrfm136z56ihlkhsd8v2s";
+    sha256 = "0lnlf56ysisa45dxvbwzhl4fgyxyfz35psals2kv9x8gyq54zwpm";
   };
 
   buildInputs = with ocamlPackages;