diff --git a/Gemfile b/Gemfile
index 8e54bee6..3d5a85b0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'kramdown', '~> 1.17'
-gem 'middleman', '~> 4.2'
+gem 'middleman', '~> 4.3'
 gem 'middleman-deploy', '~> 2.0.0.pre.alpha'
 gem 'middleman-autoprefixer', '~> 2.10'
 gem 'middleman-livereload', '~> 3.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index f6f291aa..c3f1127f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
+    addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
     ast (2.4.0)
     autoprefixer-rails (9.4.5)
@@ -16,8 +16,6 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    compass-import-once (1.0.5)
-      sass (>= 3.2, < 3.5)
     concurrent-ruby (1.1.4)
     contracts (0.13.0)
     diff-lcs (1.3)
@@ -30,7 +28,7 @@ GEM
     execjs (2.7.0)
     fast_blank (1.0.0)
     fastimage (2.1.5)
-    ffi (1.10.0)
+    ffi (1.9.25)
     fuubar (2.3.2)
       rspec-core (~> 3.0)
       ruby-progressbar (~> 1.4)
@@ -41,31 +39,30 @@ GEM
       concurrent-ruby (~> 1.0)
     hashie (3.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.2)
     kramdown (1.17.0)
     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)
+    middleman (4.3.2)
       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)
+      middleman-cli (= 4.3.2)
+      middleman-core (= 4.3.2)
     middleman-autoprefixer (2.10.0)
       autoprefixer-rails (>= 9.1.4)
       middleman-core (>= 3.3.3)
-    middleman-cli (4.2.1)
+    middleman-cli (4.3.2)
       thor (>= 0.17.0, < 2.0)
-    middleman-core (4.2.1)
+    middleman-core (4.3.2)
       activesupport (>= 4.2, < 5.1)
       addressable (~> 2.3)
       backports (~> 3.6)
-      bundler (~> 1.1)
+      bundler
       contracts (~> 0.13.0)
       dotenv
       erubis
@@ -74,15 +71,15 @@ 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-deploy (2.0.0.pre.alpha)
       middleman-core (>= 3.2)
@@ -138,10 +135,12 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.4.0)
     ruby-progressbar (1.10.0)
-    sass (3.4.25)
+    sassc (2.0.0)
+      ffi (~> 1.9.6)
+      rake
     servolux (0.13.0)
     temple (0.8.0)
-    thor (0.20.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.9)
     tzinfo (1.2.5)
@@ -156,7 +155,7 @@ PLATFORMS
 DEPENDENCIES
   fuubar
   kramdown (~> 1.17)
-  middleman (~> 4.2)
+  middleman (~> 4.3)
   middleman-autoprefixer (~> 2.10)
   middleman-deploy (~> 2.0.0.pre.alpha)
   middleman-livereload (~> 3.4)