diff --git a/pom.xml b/pom.xml
index 18fb464..3f1164c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -133,6 +133,9 @@
                 </goals>
               </execution>
             </executions>
+            <configuration>
+              <source>8</source>
+            </configuration>
           </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>