diff --git a/services/tracktrain.nix b/services/tracktrain.nix
index fc4e308..42eca90 100644
--- a/services/tracktrain.nix
+++ b/services/tracktrain.nix
@@ -88,6 +88,7 @@ in
       services.postgresql = {
         enable = true;
 
+        package = pkgs.postgresql_15;
         ensureDatabases = [ "tracktrain" ];
         ensureUsers = [ {
           name = "tracktrain";