README.md in google-cloud-dialogflow-0.8.0 vs README.md in google-cloud-dialogflow-0.9.0

- old
+ new

@@ -57,13 +57,13 @@
 end
 ```
 
 ## Supported Ruby Versions
 
-This library is supported on Ruby 2.3+.
+This library is supported on Ruby 2.4+.
 
 Google provides official support for Ruby versions that are actively supported
 by Ruby Core—that is, Ruby versions that are either in normal maintenance or
-in security maintenance, and not end of life. Currently, this means Ruby 2.3
+in security maintenance, and not end of life. Currently, this means Ruby 2.4
 and later. Older versions of Ruby _may_ still work, but are unsupported and not
 recommended. See https://www.ruby-lang.org/en/downloads/branches/ for details
 about the Ruby support schedule.