diff --git a/pkgs/development/python-modules/zc_lockfile/default.nix b/pkgs/development/python-modules/zc_lockfile/default.nix
index c51f5ebf049..110b7000e73 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 = "1.3.0";
+  version = "1.4";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "96cb13769e042988ea25d23d44cf09342ea0f887083d0f9736968f3617665853";
+    sha256 = "0lrj2zdr06sff7i151710jbbnnhx4phdc0qpns8jkarpd62f7a4m";
   };
 
   buildInputs = [ mock ];