diff --git a/Gemfile b/Gemfile
index 478cf4fc5b..b0a5f82343 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,10 +4,10 @@ source 'https://rubygems.org'
 
 gem 'travis-web', path: 'waiter'
 gem 'puma'
-gem 'rack-ssl', '~> 1.3'
-gem 'rack-protection', '~> 1.3'
+gem 'rack-ssl', '~> 1.4', '>= 1.4.1'
+gem 'rack-protection', '~> 1.5', '>= 1.5.3'
 gem 'rack-mobile-detect'
-gem 'sinatra'
+gem 'sinatra', '>= 2.0.0'
 gem 'hashr'
 
 group :development, :test do
@@ -22,5 +22,5 @@ end
 
 group :test do
   gem 'rspec', '~> 2.11'
-  gem 'sinatra-contrib'
+  gem 'sinatra-contrib', '>= 2.0.0'
 end