Update test dependencies to more secure versions (fixes #1 #2)
diff --git a/org.eclipse.sisu.plexus.tests/pom.xml b/org.eclipse.sisu.plexus.tests/pom.xml
index 8d66817..2d92978 100644
--- a/org.eclipse.sisu.plexus.tests/pom.xml
+++ b/org.eclipse.sisu.plexus.tests/pom.xml
@@ -40,7 +40,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.11</version>
+      <version>4.13.1</version>
     </dependency>
     <dependency>
       <groupId>ch.qos.logback</groupId>
diff --git a/org.eclipse.sisu.plexus/pom.xml b/org.eclipse.sisu.plexus/pom.xml
index 081c65c..eb75916 100644
--- a/org.eclipse.sisu.plexus/pom.xml
+++ b/org.eclipse.sisu.plexus/pom.xml
@@ -81,7 +81,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.11</version>
+      <version>4.13.1</version>
       <optional>true</optional>
     </dependency>
   </dependencies>