diff --git a/Gemfile b/Gemfile
index 533d7665..eaf3548b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,16 +2,16 @@ source "https://rubygems.org"
 
 ruby "2.2.4"
 
-gem "rails", "4.2.5.2"
+gem "rails", "5.2.4.3"
 gem "pg"
 
 # assets
 gem "autoprefixer-rails"
-gem "coffee-rails"
+gem "coffee-rails", ">= 4.2.2"
 gem "foundation-icons-sass-rails"
 gem "foundation-rails", "~> 5.5.2.1"
-gem "jquery-rails"
-gem "sass-rails", "~> 5.0.0"
+gem "jquery-rails", ">= 4.1.1"
+gem "sass-rails", "~> 5.0.5"
 gem "skim", git: "https://github.com/jfirebaugh/skim"
 gem "therubyracer", platforms: :ruby
 gem "uglifier", ">= 2.7.2"
@@ -20,13 +20,13 @@ gem "uglifier", ">= 2.7.2"
 gem "active_link_to"
 gem "country_select"
 gem "metamagic"
-gem "simple_form"
+gem "simple_form", ">= 4.0.0"
 gem "slim"
 
 # all other gems
 gem "decent_decoration"
 gem "decent_exposure"
-gem "devise"
+gem "devise", ">= 4.4.2"
 gem "draper"
 gem "flamegraph"
 gem "geocoder"
@@ -41,7 +41,7 @@ gem "puma"
 gem "pundit"
 gem "rack-canonical-host"
 gem "rack-mini-profiler", require: false
-gem "responders"
+gem "responders", ">= 2.4.0"
 gem "rollbar"
 gem "seedbank"
 gem "stackprof"
@@ -72,7 +72,7 @@ group :development, :test do
   gem "bundler-audit", require: false
   gem "byebug"
   gem "coffeelint"
-  gem "dotenv-rails"
+  gem "dotenv-rails", ">= 2.2.2"
   gem "factory_girl_rails"
   gem "faker"
   gem "fuubar", "~> 2.0.0.rc1"
@@ -80,7 +80,7 @@ group :development, :test do
   gem "jasmine-jquery-rails"
   gem "pry-rails"
   gem "rails_best_practices", require: false
-  gem "rspec-rails", "~> 3.0"
+  gem "rspec-rails", "~> 3.5", ">= 3.5.0"
   gem "rubocop", require: false
   gem "rubocop-rspec", require: false
   gem "scss_lint", require: false
@@ -93,8 +93,8 @@ group :development do
   gem "letter_opener"
   gem "quiet_assets"
   gem "rails-erd"
-  gem "slim-rails"
+  gem "slim-rails", ">= 3.1.0"
   gem "spring"
   gem "spring-commands-rspec"
-  gem "web-console", "~> 2.0"
+  gem "web-console", "~> 2.3", ">= 2.3.0"
 end