diff --git a/lib/mv/vereinfacht/changes/sync_linked_member_after_user_change.ex b/lib/mv/vereinfacht/changes/sync_linked_member_after_user_change.ex
index e5cb599..cffb079 100644
--- a/lib/mv/vereinfacht/changes/sync_linked_member_after_user_change.ex
+++ b/lib/mv/vereinfacht/changes/sync_linked_member_after_user_change.ex
@@ -17,13 +17,20 @@ defmodule Mv.Vereinfacht.Changes.SyncLinkedMemberAfterUserChange do
 
   @impl true
   def change(changeset, _opts, _context) do
-    if Mv.Config.vereinfacht_configured?() do
+    if Mv.Config.vereinfacht_configured?() and relevant_change?(changeset) do
       Ash.Changeset.after_transaction(changeset, &sync_linked_member_after_transaction/2)
     else
       changeset
     end
   end
 
+  # Only sync when something that affects the linked member's data actually changed
+  # (email sync or member link), to avoid unnecessary API calls on every user update.
+  defp relevant_change?(changeset) do
+    Ash.Changeset.changing_attribute?(changeset, :email) or
+      Ash.Changeset.changing_relationship?(changeset, :member)
+  end
+
   defp sync_linked_member_after_transaction(_changeset, {:ok, user}) do
     case load_linked_member(user) do
       nil ->