diff --git a/pom.xml b/pom.xml
index 218d327..02e0ca0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.maven</groupId>
     <artifactId>maven-parent</artifactId>
-    <version>19</version>
+    <version>21</version>
   </parent>
   
   <groupId>org.apache.maven.mae</groupId>
@@ -113,14 +113,12 @@
         </plugin>
         <plugin>
           <artifactId>maven-release-plugin</artifactId>
-          <version>2.0</version>
           <configuration>
             <autoVersionSubmodules>true</autoVersionSubmodules>
           </configuration>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.5</version>
           <configuration>
             <excludes>
               <exclude>**/testutil/*</exclude>
@@ -130,7 +128,6 @@
         </plugin>
         <plugin>
           <artifactId>maven-compiler-plugin</artifactId>
-          <version>2.3</version>
           <configuration>
             <source>1.6</source>
             <target>1.6</target>
@@ -142,7 +139,6 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-jar-plugin</artifactId>
-          <version>2.3</version>
           <configuration>
             <archive>
               <manifest>