diff --git a/default.nix b/default.nix
index 27e9147..66c1f69 100644
--- a/default.nix
+++ b/default.nix
@@ -49,6 +49,7 @@ let
     documentation.man.enable = false;
     nix.settings.trusted-public-keys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
     nix.settings.substituters = ["https://nixbld.m-labs.hk?priority=10"];
+    system.stateVersion = pkgs.lib.trivial.release;
   };
 
 in