diff --git a/pom.xml b/pom.xml
index 68beec6..b5cc33f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -214,7 +214,7 @@
       <dependency>
         <groupId>com.thoughtworks.qdox</groupId>
         <artifactId>qdox</artifactId>
-        <version>2.0-M3</version>
+        <version>2.0-M4</version>
       </dependency>
 
       <dependency>
@@ -272,6 +272,7 @@
         <plugin>
           <groupId>org.codehaus.plexus</groupId>
           <artifactId>plexus-component-metadata</artifactId>
+          <version>1.7</version>
           <executions>
             <execution>
               <goals>
@@ -381,5 +382,51 @@
         </plugins>
       </reporting>
     </profile>
+    <profile>
+      <activation>
+        <jdk>[1.9,)</jdk>
+      </activation>
+      <!-- chicken-egg problem. Can only be built with Java9 once maven-plugin-plugin 3.5 is available -->
+<!--       <build> -->
+<!--         <plugins> -->
+<!--           <plugin> -->
+<!--             <artifactId>maven-enforcer-plugin</artifactId> -->
+<!--             <executions> -->
+<!--               <execution> -->
+<!--                 <id>enforce-bytecode-version</id> -->
+<!--                 <configuration> -->
+<!--                   <rules> -->
+<!--                     <enforceBytecodeVersion> -->
+<!--                       <maxJdkVersion>1.9</maxJdkVersion> -->
+<!--                     </enforceBytecodeVersion> -->
+<!--                   </rules> -->
+<!--                 </configuration> -->
+<!--               </execution> -->
+<!--             </executions> -->
+<!--             <dependencies> -->
+<!--               <dependency> -->
+<!--                 <groupId>org.codehaus.mojo</groupId> -->
+<!--                 <artifactId>extra-enforcer-rules</artifactId> -->
+<!--                 <version>1.0-beta-5</version> -->
+<!--               </dependency> -->
+<!--             </dependencies> -->
+<!--           </plugin> -->
+<!--         </plugins> -->
+<!--       </build> -->
+      <dependencyManagement>
+        <dependencies>
+          <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm</artifactId>
+            <version>6.0_ALPHA</version>
+          </dependency>
+          <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm-commons</artifactId>
+            <version>6.0_ALPHA</version>
+          </dependency>
+        </dependencies>
+      </dependencyManagement>
+    </profile>
   </profiles>
 </project>