upgrade parent
diff --git a/pom.xml b/pom.xml
index cf92b95..2fc5d9a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.commons</groupId>
     <artifactId>commons-parent</artifactId>
-    <version>46</version>
+    <version>47</version>
   </parent>
 
   <artifactId>commons-weaver-base</artifactId>