diff --git a/pom.xml b/pom.xml
index 39a675e2..8814acb8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -67,6 +67,9 @@
           <executions>
             <execution>
               <id>default-compile</id>
+              <configuration>
+                <release>9</release>
+              </configuration>
             </execution>
             <execution>
               <id>base-compile</id>