diff --git a/nixos/upgrade/postgresql.nix b/nixos/upgrade/postgresql.nix
index d683f3f..081a123 100644
--- a/nixos/upgrade/postgresql.nix
+++ b/nixos/upgrade/postgresql.nix
@@ -7,7 +7,7 @@
     (let
       # XXX specify the postgresql package you'd like to upgrade to.
       # Do not forget to list the extensions you need.
-      newPostgres = pkgs.postgresql_15.withPackages (pp: [
+      newPostgres = pkgs.postgresql_16.withPackages (pp: [
         # pp.plv8
       ]);
     in