diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 5fc8e228dd96..1ad11bbd4cf3 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -13512,15 +13512,15 @@ in {
   mccabe = callPackage ../development/python-modules/mccabe { };
 
   mechanize = buildPythonPackage (rec {
-    name = "mechanize-0.2.5";
+    name = "mechanize-0.3.5";
     disabled = isPy3k;
 
     src = pkgs.fetchurl {
       url = "mirror://pypi/m/mechanize/${name}.tar.gz";
-      sha256 = "0rj7r166i1dyrq0ihm5rijfmvhs8a04im28lv05c0c3v206v4rrf";
+      sha256 = "0rki9nl4y42q694parafcsdcdqvkdjckrbg6n0691302lfsrkyfl";
     };
 
-    propagatedBuildInputs = with self; [ clientform ];
+    propagatedBuildInputs = with self; [ clientform html5lib ];
 
     doCheck = false;