diff --git a/pkgs/applications/science/logic/ltl2ba/default.nix b/pkgs/applications/science/logic/ltl2ba/default.nix
index f0947fa0ed6..f33152a8767 100644
--- a/pkgs/applications/science/logic/ltl2ba/default.nix
+++ b/pkgs/applications/science/logic/ltl2ba/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "ltl2ba-${version}";
-  version = "1.1";
+  version = "1.2b1";
 
   src = fetchurl {
     url    = "http://www.lsv.ens-cachan.fr/~gastin/ltl2ba/${name}.tar.gz";
-    sha256 = "16z0gc7a9dkarwn0l6rvg5jdhw1q4qyn4501zlchy0zxqddz0sx6";
+    sha256 = "1f4jnkfkyj8lcc5qfqbiypfc11rhhpqqi6xs9xx5dysg6r6303wm";
   };
 
   hardeningDisable = [ "format" ];