diff --git a/docs/v3/Gemfile b/docs/v3/Gemfile
index 32feed1b251..544d8c9acf3 100644
--- a/docs/v3/Gemfile
+++ b/docs/v3/Gemfile
@@ -3,7 +3,7 @@ source 'http://rubygems.org'
 gem 'json', '>= 2.3.0'
 gem 'middleman', '~> 4.3'
 gem 'middleman-syntax', '2.1'
-gem 'middleman-autoprefixer', '~> 2.7'
+gem 'middleman-autoprefixer', '~> 3.0'
 gem 'middleman-sprockets', '~> 4.1'
 gem 'middleman-gh-pages', '>= 0.0.3'
 gem 'middleman-livereload', '>= 3.4.6'
diff --git a/docs/v3/Gemfile.lock b/docs/v3/Gemfile.lock
index 2bc7a29e5f6..a99f3110f6c 100644
--- a/docs/v3/Gemfile.lock
+++ b/docs/v3/Gemfile.lock
@@ -1,21 +1,21 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (5.2.4.4)
+    activesupport (5.2.6)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    autoprefixer-rails (9.8.6.5)
-      execjs
-    backports (3.18.2)
+    autoprefixer-rails (10.2.5.0)
+      execjs (< 2.8.0)
+    backports (3.21.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     contracts (0.13.0)
     dotenv (2.7.6)
     em-websocket (0.5.2)
@@ -25,8 +25,8 @@ GEM
     eventmachine (1.2.7)
     execjs (2.7.0)
     fast_blank (1.0.0)
-    fastimage (2.2.0)
-    ffi (1.13.1)
+    fastimage (2.2.3)
+    ffi (1.15.0)
     haml (5.2.0)
       temple (>= 0.8.0)
       tilt
@@ -50,9 +50,9 @@ GEM
       kramdown (>= 2.3.0)
       middleman-cli (= 4.3.11)
       middleman-core (= 4.3.11)
-    middleman-autoprefixer (2.10.1)
-      autoprefixer-rails (~> 9.1)
-      middleman-core (>= 3.3.3)
+    middleman-autoprefixer (3.0.0)
+      autoprefixer-rails (~> 10.0)
+      middleman-core (>= 4.0.0)
     middleman-cli (4.3.11)
       thor (>= 0.17.0, < 2.0)
     middleman-core (4.3.11)
@@ -93,7 +93,7 @@ GEM
     mini_portile2 (2.4.0)
     mini_racer (0.3.1)
       libv8 (~> 8.4.255)
-    minitest (5.14.2)
+    minitest (5.14.4)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     padrino-helpers (0.13.3.4)
@@ -102,13 +102,13 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.19.2)
+    parallel (1.20.1)
     public_suffix (4.0.6)
     rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rake (13.0.1)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.5.0)
@@ -129,7 +129,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.7)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -140,7 +140,7 @@ PLATFORMS
 DEPENDENCIES
   json (>= 2.3.0)
   middleman (~> 4.3)
-  middleman-autoprefixer (~> 2.7)
+  middleman-autoprefixer (~> 3.0)
   middleman-gh-pages (>= 0.0.3)
   middleman-livereload (>= 3.4.6)
   middleman-sprockets (~> 4.1)