diff --git a/maven-plugin-tools-model/pom.xml b/maven-plugin-tools-model/pom.xml
index b28870e..3e0a35f 100644
--- a/maven-plugin-tools-model/pom.xml
+++ b/maven-plugin-tools-model/pom.xml
@@ -37,7 +37,7 @@
       <plugin>
         <groupId>org.codehaus.modello</groupId>
         <artifactId>modello-maven-plugin</artifactId>
-          <version>1.0-alpha-20</version>
+          <version>1.0-alpha-21</version>
         <configuration>
           <models>
             <model>src/main/mdo/plugin-metadata.mdo</model>