add empty relativePath
diff --git a/pom.xml b/pom.xml
index 2bc89c0..c4645b5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,6 +24,7 @@
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
         <version>31</version>
+        <relativePath/>
     </parent>
 
     <artifactId>org.apache.sling.commons.metrics-rrd4j</artifactId>