diff --git a/pkgs/development/python-modules/dpcontracts/default.nix b/pkgs/development/python-modules/dpcontracts/default.nix
index 6844f28ebf13..15bf0d2fee3f 100644
--- a/pkgs/development/python-modules/dpcontracts/default.nix
+++ b/pkgs/development/python-modules/dpcontracts/default.nix
@@ -8,7 +8,7 @@
 
 buildPythonPackage {
   pname = "dpcontracts";
-  version = "unstable-2018-11-20";
+  version = "0.6.0-unstable-2018-11-20";
   pyproject = true;
 
   __structuredAttrs = true;