diff --git a/hosts/vps1/services/mailserver.nix b/hosts/vps1/services/mailserver.nix
index fc571af..000ba85 100644
--- a/hosts/vps1/services/mailserver.nix
+++ b/hosts/vps1/services/mailserver.nix
@@ -7,6 +7,7 @@ in
 {
   mailserver = {
     enable = true;
+    stateVersion = 3;
     fqdn = domain;
     domains = [
       rootDomain