diff --git a/Gemfile b/Gemfile
index ce10b1f0..31ce5c9b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,15 +5,15 @@ gem 'rake'
 
 # for running the server
 gem "eventmachine", "1.0.0.rc.4"
-gem 'thin'
-gem 'rack'
+gem 'thin', '>= 1.4.1'
+gem 'rack', '>= 2.1.4'
 
 # for le styles
 gem 'sass'
 gem 'bourbon'
 
 # for running tests
-gem 'jasmine'
+gem 'jasmine', '>= 2.0.0'
 
 # for running the tests like a hipster
 gem 'jasmine-headless-webkit'