README.md in knapsack_pro-2.9.0 vs README.md in knapsack_pro-2.10.0

@@ -48,10 +48,10 @@
 
 We keep this old FAQ in README to not break old links spread across the web. You can see old FAQ list of questions for common problems and tips in below [Table of Contents](#table-of-contents). Scroll 1 page down and you will see the FAQ in the table of contents.
 
 # Requirements
 
-`>= Ruby 2.0.0`
+`>= Ruby 2.1.0`
 
 # Table of Contents
 
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