diff --git a/pom.xml b/pom.xml
index ec7491a2..64d4317b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -266,7 +266,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-site-plugin</artifactId>
-                <version>2.1-SNAPSHOT</version>
+                <version>2.1.1-SNAPSHOT</version>
             </plugin>
         </plugins>
     </build>
@@ -316,6 +316,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>2.4</version>
                 <configuration>
                     <configLocation>src/checkstyle/checkstyle-configuration.xml</configLocation>
                 </configuration>