diff --git a/Gemfile b/Gemfile
index d6ec76e6ffa..a0c14f6b11d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 # Middleman
 gem 'middleman', '~>4.3'
 gem 'middleman-syntax', '~> 3.0'
-gem 'middleman-autoprefixer', '~> 2.7'
+gem 'middleman-autoprefixer', '~> 3.0'
 gem 'middleman-sprockets', '~> 4.1'
 gem 'rouge', '~> 2.0.5'
 gem 'redcarpet', '~> 3.4.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 15e3d633504..fbe283dcd7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,23 +6,23 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
-    autoprefixer-rails (9.5.1.1)
-      execjs
-    backports (3.15.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    autoprefixer-rails (10.3.3.0)
+      execjs (~> 2)
+    backports (3.21.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.9)
     contracts (0.13.0)
-    dotenv (2.7.2)
+    dotenv (2.7.6)
     erubis (2.7.0)
-    execjs (2.7.0)
-    fast_blank (1.0.0)
-    fastimage (2.1.5)
-    ffi (1.11.1)
+    execjs (2.8.1)
+    fast_blank (1.0.1)
+    fastimage (2.2.5)
+    ffi (1.15.4)
     haml (5.1.1)
       temple (>= 0.8.0)
       tilt
@@ -35,16 +35,16 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.16.0)
+    memoist (0.16.2)
     middleman (4.3.4)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
       kramdown (~> 1.2)
       middleman-cli (= 4.3.4)
       middleman-core (= 4.3.4)
-    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 (4.3.4)
       thor (>= 0.17.0, < 2.0)
     middleman-core (4.3.4)
@@ -77,7 +77,7 @@ GEM
       middleman-core (>= 3.2)
       rouge (~> 2.0)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
+    minitest (5.14.4)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     padrino-helpers (0.13.3.4)
@@ -86,12 +86,11 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.17.0)
-    public_suffix (3.1.0)
-    rack (2.0.7)
-    rake (12.3.2)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    parallel (1.21.0)
+    public_suffix (4.0.6)
+    rack (2.2.3)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.4.0)
     rouge (2.0.7)
@@ -100,9 +99,8 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sassc (2.0.1)
+    sassc (2.4.0)
       ffi (~> 1.9)
-      rake
     servolux (0.13.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -110,8 +108,8 @@ GEM
     temple (0.8.1)
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.9)
-    tzinfo (1.2.5)
+    tilt (2.0.10)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -121,7 +119,7 @@ PLATFORMS
 
 DEPENDENCIES
   middleman (~> 4.3)
-  middleman-autoprefixer (~> 2.7)
+  middleman-autoprefixer (~> 3.0)
   middleman-sprockets (~> 4.1)
   middleman-syntax (~> 3.0)
   nokogiri (~> 1.10.4)