diff --git a/pkgs/development/python-modules/chameleon/default.nix b/pkgs/development/python-modules/chameleon/default.nix
index 1a2811b50b67..104bdb86bf00 100644
--- a/pkgs/development/python-modules/chameleon/default.nix
+++ b/pkgs/development/python-modules/chameleon/default.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "Chameleon";
-  version = "2.25";
+  version = "3.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0va95cml7wfjpvgj3dc9xdn8psyjh3zbk6v51b0hcqv2fzh409vb";
+    sha256 = "1a83jf211mqjhgbd3abqyrn4mp4vb077ql8fydmv80xg3whrf3yb";
   };
 
   meta = with stdenv.lib; {