diff --git a/nixos/modules/services/mail/roundcube.nix b/nixos/modules/services/mail/roundcube.nix
index 16e3c7d81e7c..d5990950a2b3 100644
--- a/nixos/modules/services/mail/roundcube.nix
+++ b/nixos/modules/services/mail/roundcube.nix
@@ -9,7 +9,7 @@ let
   fpm = config.services.phpfpm.pools.roundcube;
   localDB = cfg.database.host == "localhost";
   user = cfg.database.username;
-  phpWithPspell = pkgs.php83.withExtensions ({ enabled, all }: [ all.pspell ] ++ enabled);
+  phpWithPspell = pkgs.php84.withExtensions ({ enabled, all }: [ all.pspell ] ++ enabled);
 
   env = {
     ASPELL_CONF = "dict-dir ${pkgs.aspellWithDicts (_: cfg.dicts)}/lib/aspell";