diff --git a/Gemfile b/Gemfile
index f267351..a98c9ca 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,9 +1,9 @@
 source 'https://rubygems.org'
 ruby '2.0.0'
 
-gem 'thin'
-gem 'sinatra'
+gem 'thin', '>= 1.6.2'
+gem 'sinatra', '>= 2.0.0'
 
 gem 'youtube_it'
-gem 'omniauth-twitter'
+gem 'omniauth-twitter', '>= 1.2.0'
 gem 'twitter'