update dependecy versions (#3)

diff --git a/pom.xml b/pom.xml
index 2e1dcf2..40676c9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -100,22 +100,22 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-interpolation</artifactId>
-      <version>1.25</version>
+      <version>1.26</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.2.0</version>
+      <version>3.3.0</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-archiver</artifactId>
-      <version>4.1.0</version>
+      <version>4.2.2</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.5</version>
+      <version>2.6</version>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
@@ -126,7 +126,7 @@
     <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>2.1</version>
+      <version>3.3.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>