use last parent

pom.xml

diff --git a/pom.xml b/pom.xml
index 093a246..d8ebc96 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.archiva</groupId>
     <artifactId>archiva-parent</artifactId>
-    <version>13-SNAPSHOT</version>
+    <version>16-SNAPSHOT</version>
     <relativePath>../parent/pom.xml</relativePath>
   </parent>
   <artifactId>redback-site</artifactId>