Revert "update dependencies: JUnit and Plexus"

This reverts commit 5e51b2268c44158eeeb1a334ee545e68fac7f8fd.
diff --git a/pom.xml b/pom.xml
index a41abc9..39a41b4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -190,14 +190,14 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-utils</artifactId>
-        <version>3.3.0</version>
+        <version>3.0.15</version>
         <scope>provided</scope>
       </dependency>    
     
       <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
-        <version>4.13</version>
+        <version>4.11</version>
         <scope>provided</scope>
       </dependency>    
     </dependencies>