diff --git a/roundcube.nix b/roundcube.nix
index 154a979..990aadf 100644
--- a/roundcube.nix
+++ b/roundcube.nix
@@ -15,6 +15,7 @@ let
       $config['smtp_pass'] = '%p';
       $config['product_name'] = 'Webmail';
       $config['des_key'] = file_get_contents("${config.variables.roundcubeDataDir}/des_key");;
+      $config['cipher_method'] = 'AES256-GCM-SHA384';
       $config['plugins'] = array(
         'archive',
         'managesieve',