diff --git a/build.sbt b/build.sbt
index 7a90a5a..66204d5 100644
--- a/build.sbt
+++ b/build.sbt
@@ -15,8 +15,7 @@ libraryDependencies ++= Seq(
   "com.typesafe.akka" %% "akka-actor" % akkaVersion,
   "com.typesafe.akka" %% "akka-cluster" % akkaVersion,
   "com.typesafe.akka" %% "akka-cluster-metrics" % akkaVersion,
-  "org.fusesource" % "sigar" % "1.6.4",
-  "org.apache.commons" % "commons-collections4" % "4.0"
+  "org.fusesource" % "sigar" % "1.6.4"
 )
 
 assemblyMergeStrategy in assembly := {
diff --git a/doc/protocol.png b/doc/protocol.png
index 2636eb9..3f61336 100644
Binary files a/doc/protocol.png and b/doc/protocol.png differ
diff --git a/doc/protocol.xml b/doc/protocol.xml
index 88cf2b9..031d213 100644
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@@ -1 +1 @@
-<mxfile type="device" userAgent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36" version="5.3.5.0" editor="www.draw.io"><diagram>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</diagram></mxfile>
\ No newline at end of file
+<mxfile userAgent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36" version="5.4.1.3" editor="www.draw.io" type="device"><diagram>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</diagram></mxfile>
\ No newline at end of file