diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7dfb570c..77590066 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -39,7 +39,7 @@ Working on your first Pull Request? You can learn how from this *free* series [H
 
 | Prerequisite                                                  | Version |
 | ------------------------------------------------------------- | ------- |
-| [Sencha](https://www.sencha.com/products/extjs/cmd-download/) | `=6.1.2.15`  |
+| [Sencha](https://www.sencha.com/products/extjs/cmd-download/) | `=6.6.0.13`  |
 | [Ruby](https://www.ruby-lang.org/en/downloads/)               | `=2.3` |
 | [Node.js](https://nodejs.org)                                 | `~ ^4.0.0`  |
 | npm (comes with Node)                                         | `~ ^3.8.7`  |