--- old/src/java.base/share/classes/java/util/ConcurrentModificationException.java	2019-08-27 17:28:51.826324386 -0700
+++ new/src/java.base/share/classes/java/util/ConcurrentModificationException.java	2019-08-27 17:28:51.614324386 -0700
@@ -68,6 +68,7 @@
  * @since   1.2
  */
 public class ConcurrentModificationException extends RuntimeException {
+    @java.io.Serial
     private static final long serialVersionUID = -3666751008965953603L;
 
     /**