Comments on version updates.
diff --git a/pom.xml b/pom.xml
index 7294774..1c91acf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,6 +49,8 @@
 Removed obsolete notice plugin
 Removed obsolete svn-buildnumber plugin and profiles
 Removed obsolete clover plugin and profile
+build-helper-maven-plugin 1.12 -> 3.0.0
+maven-gpg-plugin 1.4 -> 1.6
 maven-assembly-plugin 3.0.0 -> 3.1.0
 maven-compiler-plugin 3.6.0 -> 3.6.1
 maven-compiler-plugin 3.6.1 -> 3.6.2