diff --git a/pkgs/development/python-modules/tskit/default.nix b/pkgs/development/python-modules/tskit/default.nix
index 839df33507ce..b8572e0f3541 100644
--- a/pkgs/development/python-modules/tskit/default.nix
+++ b/pkgs/development/python-modules/tskit/default.nix
@@ -11,14 +11,14 @@
 
 buildPythonPackage rec {
   pname = "tskit";
-  version = "0.6.3";
+  version = "0.6.4";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-bbo89pMhTDEF2M3c1pauDjECNmk34CmmqmXNmOcbVfI=";
+    hash = "sha256-vawbt+OuPR9WLsGRtdhAFW4ILdKtxq98QbFwxPsb55I=";
   };
 
   postPatch = ''