diff --git a/pregelix-example/pom.xml b/pregelix-example/pom.xml
index 6b9bc89..0cda633 100644
--- a/pregelix-example/pom.xml
+++ b/pregelix-example/pom.xml
@@ -23,6 +23,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-assembly-plugin</artifactId>
+                <version>2.2-beta-5</version>
 				<configuration>
 					<descriptorRefs>
 						<descriptorRef>jar-with-dependencies</descriptorRef>
@@ -41,6 +42,7 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>appassembler-maven-plugin</artifactId>
+                <version>1.3</version>
 				<executions>
 					<execution>
 						<configuration>
@@ -76,6 +78,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-clean-plugin</artifactId>
+				<version>2.4.1</version>
 				<configuration>
 					<filesets>
 						<fileset>