diff --git a/pom.xml b/pom.xml
index 887e9a9..e9249d5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -127,6 +127,7 @@
         <version>3.1.1</version>
         <configuration>
           <doclint>none</doclint>
+          <source>8</source>
         </configuration>
         <executions>
           <execution>