diff --git a/pregelix-dataflow-std/pom.xml b/pregelix-dataflow-std/pom.xml
index c5a0913..7f401f5 100644
--- a/pregelix-dataflow-std/pom.xml
+++ b/pregelix-dataflow-std/pom.xml
@@ -23,8 +23,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>2.0.2</version>
 				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
+					<source>1.6</source>
+					<target>1.6</target>
 					<fork>true</fork>
 				</configuration>
 			</plugin>
@@ -43,8 +43,9 @@
 				</configuration>
 			</plugin>
 			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-clean-plugin</artifactId>
-				<version>2.5</version>
+				<version>2.4.1</version>
 				<configuration>
 					<filesets>
 						<fileset>