diff --git a/configuration.nix b/configuration.nix
index 5bb5826..d9098e3 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -66,6 +66,7 @@ with pkgs;
     gc = {
       automatic = true;
       options = "--delete-older-than 14d";
+      dates = "Mon 03:00";
     };
     extraOptions = ''
       keep-outputs = true