Update to latest javac
diff --git a/pom.xml b/pom.xml
index e371fcb..11bb5d6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
   </description>
 
   <properties>
-    <javac.version>9-dev-r3297-1</javac.version>
+    <javac.version>9-dev-r3297-4</javac.version>
   </properties>
 
   <dependencies>