diff --git a/machines/fanny/configuration.nix b/machines/fanny/configuration.nix
index 05c3f000..3f2dada5 100644
--- a/machines/fanny/configuration.nix
+++ b/machines/fanny/configuration.nix
@@ -26,7 +26,14 @@ in
     cacheurl = "https://cache.dynamicdiscord.de";
   };
 
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nix = {
+    settings.experimental-features = [ "nix-command" "flakes" ];
+    #always update microvms
+    extraOptions = ''
+      tarball-ttl = 0
+    '';
+  };
+
 
   malobeo.disks = {
     enable = true;