diff --git a/modules/base/default.nix b/modules/base/default.nix
index a06bdda..0ea1cda 100644
--- a/modules/base/default.nix
+++ b/modules/base/default.nix
@@ -17,13 +17,12 @@
     };
     gc = {
       automatic = true;
-      dates = "weekly";
+      interval = "weekly";
       options = "delete-older-than 7d";
-      persistent = false;
     };
     optimise = {
       automatic = true;
-      dates = [ "weekly" ];
+      interval = "weekly";
     };
   };