METRON-2079 Fix documentation for installing Ansible for fulldev Centos 6 (mmiklavc) closes apache/metron#1450
diff --git a/metron-deployment/development/centos6/README.md b/metron-deployment/development/centos6/README.md
index 99ec967..5ca3ed5 100644
--- a/metron-deployment/development/centos6/README.md
+++ b/metron-deployment/development/centos6/README.md
@@ -29,7 +29,7 @@
 
 The computer used to deploy Apache Metron will need to have the following components installed.
 
- - [Ansible](https://github.com/ansible/ansible) 2.4.0+
+ - [Ansible](https://github.com/ansible/ansible) 2.6.5
  - [Docker](https://www.docker.com/community-edition)
  - [Vagrant](https://www.vagrantup.com) 2.0+
  - [Vagrant Hostmanager Plugin](https://github.com/devopsgroup-io/vagrant-hostmanager)
@@ -53,9 +53,10 @@
 1. Run the following command in a terminal to install all of the required tools.
 
     ```
-    brew cask install vagrant virtualbox docker ansible
+    brew cask install vagrant virtualbox docker
     brew cask install caskroom/versions/java8
     brew install maven@3.3 git
+    sudo pip install ansible=2.6.5
     vagrant plugin install vagrant-hostmanager
     open /Applications/Docker.app
     ```