diff --git a/pkgs/applications/science/logic/why3/default.nix b/pkgs/applications/science/logic/why3/default.nix
index 6f338f21478..eeb3a6b6d36 100644
--- a/pkgs/applications/science/logic/why3/default.nix
+++ b/pkgs/applications/science/logic/why3/default.nix
@@ -3,11 +3,11 @@
 
 stdenv.mkDerivation {
   pname = "why3";
-  version = "1.2.0";
+  version = "1.2.1";
 
   src = fetchurl {
-    url = https://gforge.inria.fr/frs/download.php/file/37903/why3-1.2.0.tar.gz;
-    sha256 = "0xz001jhi71ja8vqrjz27v63bidrzj4qvg1yqarq6p4dmpxhk348";
+    url = https://gforge.inria.fr/frs/download.php/file/38185/why3-1.2.1.tar.gz;
+    sha256 = "014gkwisjp05x3342zxkryb729p02ngx1hcjjsrplpa53jzgz647";
   };
 
   buildInputs = with ocamlPackages; [