diff --git a/installer.nix b/installer.nix
index 6c6a64b..7eb7c97 100644
--- a/installer.nix
+++ b/installer.nix
@@ -134,5 +134,6 @@ in {
         passwordAuthentication = false;
       };
     };
+    system.stateVersion = "21.11";
   };
 }