diff --git a/Gemfile b/Gemfile
index 665421ce2..a57c2a7f1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '4.2.7.1'
 # Use PostgreSQL
-gem 'pg', '0.19.0'
+gem 'pg', '~> 0.19.0'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0', '>= 5.0.4'
 # Use Uglifier as compressor for JavaScript assets
@@ -14,7 +14,7 @@ gem 'coffee-rails', '~> 4.2.1'
 # gem 'therubyracer', platforms: :ruby
 
 # Use jquery as the JavaScript library
-gem 'jquery-rails', '4.2.1'
+gem 'jquery-rails', '~> 4.2.1'
 gem 'jquery-ui-rails'
 # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
 gem 'turbolinks'
@@ -32,11 +32,11 @@ gem 'omniauth-facebook', '~> 3.0.0'
 gem 'omniauth-google-oauth2', '~> 0.4.0'
 
 gem 'kaminari'
-gem 'ancestry', '2.2.1'
+gem 'ancestry', '~> 2.2.1'
 gem 'acts-as-taggable-on'
-gem 'responders', '2.3.0'
-gem 'foundation-rails', '6.2.4.0'
-gem 'foundation_rails_helper', '2.0.0'
+gem 'responders', '~> 2.3.0'
+gem 'foundation-rails', '~> 6.2.4.0'
+gem 'foundation_rails_helper', '~> 2.0.0'
 gem 'acts_as_votable'
 gem 'ckeditor', '~> 4.2.0'
 gem 'invisible_captcha', '~> 0.9.1'
@@ -44,8 +44,8 @@ gem 'cancancan'
 gem 'social-share-button'
 gem 'initialjs-rails', '0.2.0.4'
 gem 'unicorn', '~> 5.1.0'
-gem 'paranoia', '2.2.0'
-gem 'rinku', '2.0.2', require: 'rails_rinku'
+gem 'paranoia', '~> 2.2.0'
+gem 'rinku', '~> 2.0.2', require: 'rails_rinku'
 gem 'savon'
 gem 'dalli'
 gem 'rollbar', '~> 2.13.3'
@@ -57,11 +57,11 @@ gem 'whenever', require: false
 gem 'pg_search'
 
 gem 'ahoy_matey', '~> 1.4.2'
-gem 'groupdate', '3.1.0'   # group temporary data
-gem 'tolk', '2.0.0' # Web interface for translations
+gem 'groupdate', '~> 3.1.0'   # group temporary data
+gem 'tolk', '~> 2.0.0' # Web interface for translations
 
 gem 'browser'
-gem 'turnout', '2.4.0'
+gem 'turnout', '~> 2.4.0'
 gem 'redcarpet'
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 00780d8c2..5e99a8030 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -179,7 +179,7 @@ GEM
     geocoder (1.4.0)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
-    groupdate (3.1.0)
+    groupdate (3.1.1)
       activesupport (>= 3)
     gyoku (1.3.1)
       builder (>= 2.1.2)
@@ -442,7 +442,7 @@ DEPENDENCIES
   acts-as-taggable-on
   acts_as_votable
   ahoy_matey (~> 1.4.2)
-  ancestry (= 2.2.1)
+  ancestry (~> 2.2.1)
   browser
   bullet
   byebug
@@ -466,14 +466,14 @@ DEPENDENCIES
   email_spec
   factory_girl_rails
   faker
-  foundation-rails (= 6.2.4.0)
-  foundation_rails_helper (= 2.0.0)
+  foundation-rails (~> 6.2.4.0)
+  foundation_rails_helper (~> 2.0.0)
   fuubar
-  groupdate (= 3.1.0)
+  groupdate (~> 3.1.0)
   i18n-tasks
   initialjs-rails (= 0.2.0.4)
   invisible_captcha (~> 0.9.1)
-  jquery-rails (= 4.2.1)
+  jquery-rails (~> 4.2.1)
   jquery-ui-rails
   kaminari
   launchy
@@ -483,15 +483,15 @@ DEPENDENCIES
   omniauth-facebook (~> 3.0.0)
   omniauth-google-oauth2 (~> 0.4.0)
   omniauth-twitter
-  paranoia (= 2.2.0)
-  pg (= 0.19.0)
+  paranoia (~> 2.2.0)
+  pg (~> 0.19.0)
   pg_search
   poltergeist
   quiet_assets
   rails (= 4.2.7.1)
   redcarpet
-  responders (= 2.3.0)
-  rinku (= 2.0.2)
+  responders (~> 2.3.0)
+  rinku (~> 2.0.2)
   rollbar (~> 2.13.3)
   rspec-rails (~> 3.5)
   sass-rails (~> 5.0, >= 5.0.4)
@@ -500,9 +500,9 @@ DEPENDENCIES
   spring
   spring-commands-rspec
   sprockets (~> 3.7.0)
-  tolk (= 2.0.0)
+  tolk (~> 2.0.0)
   turbolinks
-  turnout (= 2.4.0)
+  turnout (~> 2.4.0)
   uglifier (>= 3.0.3)
   unicorn (~> 5.1.0)
   web-console (= 3.3.0)