diff --git a/pom.xml b/pom.xml
index 5acac47d..ba5984d7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,7 +51,7 @@
     <jdk.min.version>1.7</jdk.min.version>
 
     <sonar.version>5.6</sonar.version>
-    <sonar-java.version>3.13.1</sonar-java.version>
+    <sonar-java.version>4.0</sonar-java.version>
     <fbcontrib.version>6.8.0</fbcontrib.version>
     <findsecbugs.version>1.5.0</findsecbugs.version>
   </properties>
@@ -168,7 +168,7 @@
     <dependency>
       <groupId>com.thoughtworks.xstream</groupId>
       <artifactId>xstream</artifactId>
-      <version>1.4.9</version>
+      <version>1.4.20</version>
     </dependency>
 
     <dependency>