diff --git a/services/postgresql.nix b/services/postgresql.nix
index ec4b82a..4446cc8 100644
--- a/services/postgresql.nix
+++ b/services/postgresql.nix
@@ -6,35 +6,6 @@
 }: {
   # set postgresql version so we don't get any bad surprise
   config.services.postgresql = {
-    package = pkgs.postgresql_15;
+    package = pkgs.postgresql_16;
   };
-
-  config.environment.systemPackages = [
-    (let
-      # XXX specify the postgresql package you'd like to upgrade to.
-      # Do not forget to list the extensions you need.
-      newPostgres = pkgs.postgresql_16;
-      cfg = config.services.postgresql;
-    in pkgs.writeScriptBin "upgrade-pg-cluster" ''
-      set -eux
-      # XXX it's perhaps advisable to stop all services that depend on postgresql
-      systemctl stop postgresql
-
-      export NEWDATA="/var/lib/postgresql/${newPostgres.psqlSchema}"
-
-      export NEWBIN="${newPostgres}/bin"
-
-      export OLDDATA="${cfg.dataDir}"
-      export OLDBIN="${cfg.package}/bin"
-
-      install -d -m 0700 -o postgres -g postgres "$NEWDATA"
-      cd "$NEWDATA"
-      sudo -u postgres $NEWBIN/initdb -D "$NEWDATA" ${lib.escapeShellArgs cfg.initdbArgs}
-
-      sudo -u postgres $NEWBIN/pg_upgrade \
-        --old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
-        --old-bindir $OLDBIN --new-bindir $NEWBIN \
-        "$@"
-    '')
-  ];
 }