diff --git a/Gemfile b/Gemfile
index 925e56f4..75f3ff4d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,25 +1,25 @@
 source 'https://rubygems.org'
 ruby '2.3.5'
 
-gem 'devise', '~> 3.0'
+gem 'devise', '~> 4.4', '>= 4.4.2'
 gem 'geokit', '~> 1.0'
 gem 'haml', '~> 5.0'
 gem 'http_accept_language', '~> 2.0'
 gem 'local_time', '~> 2.0'
 gem 'obscenity', '~> 1.0', '>= 1.0.2'
 gem 'pg'
-gem 'rails', '~> 4.2.4'
-gem 'rails_admin', '~> 1.0'
+gem 'rails', '~> 5.2.4', '>= 5.2.4.4'
+gem 'rails_admin', '~> 1.2', '>= 1.2.0'
 gem 'validates_formatting_of', '~> 0.9.0'
 
 gem 'paranoia', '~> 2.2'
 gem 'tzinfo-data', platforms: %i[mingw mswin x64_mingw]
 
 gem 'byebug', groups: %i[development test]
-gem 'dotenv-rails', groups: %i[development test]
+gem 'dotenv-rails', '>= 2.2.2', groups: %i[development test]
 
 group :assets do
-  gem 'sass-rails', '>= 4.0.3'
+  gem 'sass-rails', '>= 5.0.6'
   gem 'uglifier'
 end