diff --git a/Gemfile b/Gemfile
index 05c312c88e30914879b71dee6b7d9c15fee6e946..7af7f7037fbd38db228961519966211cc08d3210 100644
--- a/Gemfile
+++ b/Gemfile
@@ -57,7 +57,7 @@ gem 'rack-cors', '0.3.1', :require => 'rack/cors'
 gem 'bootstrap-sass', '2.3.2.2'
 gem 'compass-rails',  '2.0.0'
 gem 'sass-rails',     '4.0.4'
-gem 'autoprefixer-rails', '4.0.2.1'
+gem 'autoprefixer-rails', '5.1.7'
 
 # Database
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 51c3655d96d30dad4965295a69aa7b2e41ab5ab3..7d1ad68855d21e79aeae287a1e5e621bea55ea29 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,8 +62,9 @@ GEM
       activemodel
       fog (>= 1.8.0)
       unf
-    autoprefixer-rails (4.0.2.1)
+    autoprefixer-rails (5.1.7)
       execjs
+      json
     backbone-on-rails (1.1.2.0)
       actionmailer
       actionpack
@@ -684,7 +685,7 @@ DEPENDENCIES
   acts_as_api (= 0.4.2)
   addressable (= 2.3.7)
   asset_sync (= 1.1.0)
-  autoprefixer-rails (= 4.0.2.1)
+  autoprefixer-rails (= 5.1.7)
   backbone-on-rails (= 1.1.2)
   bootstrap-sass (= 2.3.2.2)
   capybara (= 2.4.4)