README.md in focuslight-0.2.2 vs README.md in focuslight-0.2.3

- old
+ new

@@ -23,10 +23,10 @@
 * OSX
   * `brew install rrdtool`
 
 ## Installation
 
-Install focuslight with Ruby 2.1 or later. 
+Install focuslight with Ruby 2.4 or later.
 
 ### Gem package
 
 Five easy steps on installation with gem and SQLite.
 