diff --git a/pkgs/applications/science/logic/why3/default.nix b/pkgs/applications/science/logic/why3/default.nix
index c22c15b3a4b..a3b369ad54a 100644
--- a/pkgs/applications/science/logic/why3/default.nix
+++ b/pkgs/applications/science/logic/why3/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name    = "why3-${version}";
-  version = "1.1.1";
+  version = "1.2.0";
 
   src = fetchurl {
-    url = https://gforge.inria.fr/frs/download.php/file/37842/why3-1.1.1.tar.gz;
-    sha256 = "065ix1ill009bxg7w27s8wq47vn03vbr63hsaa79arv31d96izny";
+    url = https://gforge.inria.fr/frs/download.php/file/37903/why3-1.2.0.tar.gz;
+    sha256 = "0xz001jhi71ja8vqrjz27v63bidrzj4qvg1yqarq6p4dmpxhk348";
   };
 
   buildInputs = (with ocamlPackages; [