update parent POM
diff --git a/pom.xml b/pom.xml
index eda7b5a..3459e59 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>22</version>
+    <version>23</version>
     <relativePath>../asf/pom.xml</relativePath>
   </parent>
 
@@ -1086,11 +1086,6 @@
             </environmentVariables>
           </configuration>
         </plugin>
-        <plugin><!-- TODO remove when upgrading parent to 23 -->
-          <groupId>org.apache.rat</groupId>
-          <artifactId>apache-rat-plugin</artifactId>
-          <version>0.13</version>
-        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>