diff --git a/Gemfile b/Gemfile
index 79d41fff6dd..12cf93c90d9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 # Middleman
 gem 'middleman', '~>4.2.1'
 gem 'middleman-syntax', '~> 3.0.0'
-gem 'middleman-autoprefixer', '~> 2.7.0'
+gem 'middleman-autoprefixer', '~> 3.0.0'
 gem 'middleman-sprockets', '~> 4.1.0'
 gem 'rouge', '~> 2.0.5'
 gem 'redcarpet', '~> 3.4.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index eebb95a9694..5078eebd724 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,42 +1,41 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.1)
+    activesupport (5.0.7.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.0)
-      public_suffix (~> 2.0, >= 2.0.2)
-    autoprefixer-rails (6.6.1)
-      execjs
-    backports (3.6.8)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
+    autoprefixer-rails (10.4.7.0)
+      execjs (~> 2)
+    backports (3.23.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.10)
     contracts (0.13.0)
-    dotenv (2.2.0)
+    dotenv (2.8.1)
     erubis (2.7.0)
-    execjs (2.7.0)
-    fast_blank (1.0.0)
-    fastimage (2.0.1)
-      addressable (~> 2)
-    ffi (1.9.17)
+    execjs (2.8.1)
+    fast_blank (1.0.1)
+    fastimage (2.2.6)
+    ffi (1.15.5)
     haml (4.0.7)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.1)
+    hashie (3.6.0)
     i18n (0.7.0)
     kramdown (1.13.2)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.15.0)
+    memoist (0.16.2)
     middleman (4.2.1)
       coffee-script (~> 2.2)
       compass-import-once (= 1.0.5)
@@ -45,9 +44,9 @@ GEM
       middleman-cli (= 4.2.1)
       middleman-core (= 4.2.1)
       sass (>= 3.4.0, < 4.0)
-    middleman-autoprefixer (2.7.1)
-      autoprefixer-rails (>= 6.5.2, < 7.0.0)
-      middleman-core (>= 3.3.3)
+    middleman-autoprefixer (3.0.0)
+      autoprefixer-rails (~> 10.0)
+      middleman-core (>= 4.0.0)
     middleman-cli (4.2.1)
       thor (>= 0.17.0, < 2.0)
     middleman-core (4.2.1)
@@ -80,34 +79,34 @@ GEM
       middleman-core (>= 3.2)
       rouge (~> 2.0)
     mini_portile2 (2.3.0)
-    minitest (5.10.1)
+    minitest (5.16.3)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
-    padrino-helpers (0.13.3.3)
+    padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.13.3.3)
+      padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.13.3.3)
+    padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.10.0)
-    public_suffix (2.0.5)
-    rack (2.0.5)
-    rb-fsevent (0.9.8)
-    rb-inotify (0.9.8)
-      ffi (>= 0.5.0)
+    parallel (1.22.1)
+    public_suffix (5.0.0)
+    rack (2.2.4)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     redcarpet (3.4.0)
     rouge (2.0.7)
-    sass (3.4.23)
-    servolux (0.12.0)
+    sass (3.4.25)
+    servolux (0.13.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     thor (0.19.4)
-    thread_safe (0.3.5)
-    tilt (2.0.6)
-    tzinfo (1.2.2)
+    thread_safe (0.3.6)
+    tilt (2.0.11)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
-    uglifier (3.0.4)
+    uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
 
 PLATFORMS
@@ -115,7 +114,7 @@ PLATFORMS
 
 DEPENDENCIES
   middleman (~> 4.2.1)
-  middleman-autoprefixer (~> 2.7.0)
+  middleman-autoprefixer (~> 3.0.0)
   middleman-sprockets (~> 4.1.0)
   middleman-syntax (~> 3.0.0)
   nokogiri (~> 1.8.2)