diff --git a/pkgs/development/ocaml-modules/topkg/default.nix b/pkgs/development/ocaml-modules/topkg/default.nix
index fa238a84b35..ecd806ecadc 100644
--- a/pkgs/development/ocaml-modules/topkg/default.nix
+++ b/pkgs/development/ocaml-modules/topkg/default.nix
@@ -6,11 +6,11 @@ else
 
 stdenv.mkDerivation rec {
   name = "ocaml${ocaml.version}-topkg-${version}";
-  version = "0.8.1";
+  version = "0.9.1";
 
   src = fetchurl {
     url = "http://erratique.ch/software/topkg/releases/topkg-${version}.tbz";
-    sha256 = "18rrh6fmf708z7dd30amljmcgaypj3kk49jrmrj68r4wnw8004j8";
+    sha256 = "1slrzbmyp81xhgsfwwqs2d6gxzvqx0gcp34rq00h5iblhcq7myx6";
   };
 
   nativeBuildInputs = [ opam ];