diff --git a/Gemfile b/Gemfile
index 1735c78..d2baccb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,11 +1,11 @@
 source 'https://rubygems.org/'
 
-gem 'rails'
+gem 'rails', '>= 6.1.7.3'
 gem 'redis'
 # gem 'hiredis', :git => 'git://github.com/nviennot/hiredis-rb.git'
-gem 'sidekiq'
+gem 'sidekiq', '>= 6.2.1'
 gem 'faraday', '~> 0.8.7'
-gem 'faraday_middleware'
+gem 'faraday_middleware', '>= 0.12.0'
 gem 'net-http-persistent'
 gem 'protobuf', git: 'git://github.com/nviennot/protobuf.git', :branch => 'dev'
 gem 'stretcher', git: 'git://github.com/PoseBiz/stretcher.git'
@@ -17,22 +17,22 @@ gem 'oj'
 gem 'statsd-instrument'
 # gem 'airbrake'
 gem 'whenever', :require => false
-gem 'nokogiri', :require => false
+gem 'nokogiri', '>= 1.13.9', :require => false
 gem "ruby-progressbar", :require => false
 gem 'text', git: 'git://github.com/threedaymonk/text.git'
-gem 'rubyzip', :require => false
+gem 'rubyzip', '>= 1.3.0', :require => false
 gem 's3', :require => false
 
 # Front end only
 gem 'unicorn', :require => false
 gem 'slim'
 gem 'will_paginate'
-gem 'haml-rails'
-gem 'jquery-rails'
+gem 'haml-rails', '>= 1.0.0'
+gem 'jquery-rails', '>= 4.4.0'
 gem 'therubyracer'
 gem 'less-rails'
 gem 'twitter-bootstrap-rails', git: 'https://github.com/seyhunak/twitter-bootstrap-rails.git'
-gem 'sinatra', :require => false
+gem 'sinatra', '>= 2.2.3', :require => false
 gem 'coderay'
 # Front end only
 
@@ -41,18 +41,18 @@ group :development do
   gem 'capistrano',        :require => false
   gem 'capistrano_colors', :require => false
   gem 'rvm-capistrano',    :require => false
-  gem 'guard-livereload',  :require => false
+  gem 'guard-livereload', '>= 2.5.2', :require => false
   #gem 'gsl', :require => false
 
   # token validation
-  gem 'oauth',   :require => false
-  gem 'oauth2',  :require => false
+  gem 'oauth', '>= 0.5.5', :require => false
+  gem 'oauth2', '>= 1.4.11', :require => false
   gem 'signet',  :require => false
-  gem 'aws-sdk', :require => false
+  gem 'aws-sdk', '>= 1.52.0', :require => false
 end
 
 group :assets do
-  gem 'sass-rails',   '~> 3.2.3', :require => false
-  gem 'coffee-rails', '~> 3.2.1', :require => false
-  gem 'uglifier',     '>= 1.0.3', :require => false
+  gem 'sass-rails', '~> 5.0.8', :require => false
+  gem 'coffee-rails', '~> 4.2.2', :require => false
+  gem 'uglifier', '>= 2.7.2', :require => false
 end