diff --git a/pkgs/development/python-modules/tskit/default.nix b/pkgs/development/python-modules/tskit/default.nix
index 393b6f9be758..a871cccd4e04 100644
--- a/pkgs/development/python-modules/tskit/default.nix
+++ b/pkgs/development/python-modules/tskit/default.nix
@@ -10,12 +10,12 @@
 
 buildPythonPackage rec {
   pname = "tskit";
-  version = "0.6.4";
+  version = "1.0.0";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-vawbt+OuPR9WLsGRtdhAFW4ILdKtxq98QbFwxPsb55I=";
+    hash = "sha256-d6XzOSPVh1jsRg1A49aMWFyWVN29naYyYVXs82KQ0OA=";
   };
 
   postPatch = ''