diff --git a/pkgs/development/python-modules/zc_lockfile/default.nix b/pkgs/development/python-modules/zc_lockfile/default.nix
index 110b7000e735..173a619197ce 100644
--- a/pkgs/development/python-modules/zc_lockfile/default.nix
+++ b/pkgs/development/python-modules/zc_lockfile/default.nix
@@ -7,11 +7,11 @@
 
 buildPythonPackage rec {
   pname = "zc.lockfile";
-  version = "1.4";
+  version = "2.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0lrj2zdr06sff7i151710jbbnnhx4phdc0qpns8jkarpd62f7a4m";
+    sha256 = "307ad78227e48be260e64896ec8886edc7eae22d8ec53e4d528ab5537a83203b";
   };
 
   buildInputs = [ mock ];