diff --git a/backend/Gemfile b/backend/Gemfile
index 2520dad..d1a1b07 100644
--- a/backend/Gemfile
+++ b/backend/Gemfile
@@ -2,11 +2,11 @@ source 'https://rubygems.org'
 ruby '2.2.4'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
+gem 'rails', '~> 5.2.6', '>= 5.2.6.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3', '>= 4.3.11'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
@@ -25,9 +25,9 @@ gem 'rack-cors'
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platform: :mri
-  gem 'dotenv-rails'
+  gem 'dotenv-rails', '>= 2.2.2'
   gem 'database_cleaner'
-  gem "rspec-rails"
+  gem "rspec-rails", ">= 3.5.2"
   gem "guard"
   gem "guard-rspec"
   gem 'webmock'
@@ -35,7 +35,7 @@ end
 
 group :development do
   # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
-  gem 'web-console'
+  gem 'web-console', '>= 3.4.0'
   gem 'listen', '~> 3.0.5'
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'