diff --git a/Gemfile b/Gemfile
index f7502e0..708b0c9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'middleman', '~> 4.2'
+gem 'middleman', '~> 4.3'
 gem 'middleman-autoprefixer', '~> 2.9'
 gem 'middleman-livereload'
 gem 'tzinfo-data', platforms: [:mswin, :mingw, :jruby]
diff --git a/Gemfile.lock b/Gemfile.lock
index 927faa6..7307ff7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,25 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.7)
+    activesupport (5.2.4.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     autoprefixer-rails (8.2.0)
       execjs
-    backports (3.11.1)
+    backports (3.18.2)
     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 (1.1.7)
     contracts (0.13.0)
-    dotenv (2.2.1)
+    dotenv (2.7.6)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -27,38 +25,39 @@ GEM
     eventmachine (1.2.3)
     execjs (2.7.0)
     fast_blank (1.0.0)
-    fastimage (2.1.1)
-    ffi (1.9.23)
-    haml (4.0.7)
+    fastimage (2.2.0)
+    ffi (1.13.1)
+    haml (5.1.2)
+      temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.7)
+    hashie (3.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.7.0)
-    kramdown (1.13.2)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    kramdown (2.3.0)
+      rexml
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.16.0)
-    middleman (4.2.1)
+    memoist (0.16.2)
+    middleman (4.3.9)
       coffee-script (~> 2.2)
-      compass-import-once (= 1.0.5)
       haml (>= 4.0.5)
-      kramdown (~> 1.2)
-      middleman-cli (= 4.2.1)
-      middleman-core (= 4.2.1)
-      sass (>= 3.4.0, < 4.0)
+      kramdown (>= 2.3.0)
+      middleman-cli (= 4.3.9)
+      middleman-core (= 4.3.9)
     middleman-autoprefixer (2.9.0)
       autoprefixer-rails (~> 8.0)
       middleman-core (>= 3.3.3)
-    middleman-cli (4.2.1)
+    middleman-cli (4.3.9)
       thor (>= 0.17.0, < 2.0)
-    middleman-core (4.2.1)
-      activesupport (>= 4.2, < 5.1)
+    middleman-core (4.3.9)
+      activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
       backports (~> 3.6)
-      bundler (~> 1.1)
+      bundler
       contracts (~> 0.13.0)
       dotenv
       erubis
@@ -67,48 +66,50 @@ GEM
       fastimage (~> 2.0)
       hamster (~> 3.0)
       hashie (~> 3.4)
-      i18n (~> 0.7.0)
+      i18n (~> 0.9.0)
       listen (~> 3.0.0)
       memoist (~> 0.14)
       padrino-helpers (~> 0.13.0)
       parallel
       rack (>= 1.4.5, < 3)
-      sass (>= 3.4)
+      sassc (~> 2.0)
       servolux
-      tilt (~> 2.0)
+      tilt (~> 2.0.9)
       uglifier (~> 3.0)
     middleman-livereload (3.4.6)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
-    minitest (5.11.3)
+    minitest (5.14.2)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.12.1)
-    public_suffix (3.0.2)
+    parallel (1.19.2)
+    public_suffix (4.0.6)
     puma (3.11.3)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-contrib (1.2.0)
       rack (>= 0.9.1)
     rack-livereload (0.3.16)
       rack
-    rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    sass (3.4.25)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rexml (3.2.4)
+    sassc (2.4.0)
+      ffi (~> 1.9)
     servolux (0.13.0)
     slim (3.0.9)
       temple (>= 0.7.6, < 0.9)
       tilt (>= 1.3.3, < 2.1)
     temple (0.8.0)
-    thor (0.19.4)
+    thor (1.0.1)
     thread_safe (0.3.6)
-    tilt (2.0.8)
-    tzinfo (1.2.5)
+    tilt (2.0.10)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -117,7 +118,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  middleman (~> 4.2)
+  middleman (~> 4.3)
   middleman-autoprefixer (~> 2.9)
   middleman-livereload
   puma