diff --git a/Gemfile b/Gemfile
index 7d9d2197b7..bc28f3f03d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 ruby File.read(File.expand_path('../.ruby-version', __FILE__)).strip
 
 gem 'octokit', '~> 4.13'
-gem 'middleman', '~> 4.2'
+gem 'middleman', '~> 4.3'
 gem 'middleman-syntax'
 gem 'middleman-blog'
 gem 'middleman-compass'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2ce21fc511..dade97ffdd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.6)
+    activesupport (5.0.7.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.4.0)
@@ -33,9 +33,9 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.4)
     contracts (0.13.0)
-    dotenv (2.2.1)
+    dotenv (2.6.0)
     erubis (2.7.0)
     ethon (0.11.0)
       ffi (>= 1.3.0)
@@ -45,7 +45,7 @@ GEM
     faraday_middleware (0.12.2)
       faraday (>= 0.7.4, < 1.0)
     fast_blank (1.0.0)
-    fastimage (2.1.0)
+    fastimage (2.1.5)
     ffi (1.9.25)
     gh (0.15.1)
       addressable (~> 2.4.0)
@@ -59,11 +59,12 @@ GEM
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.6)
+    hashie (3.6.0)
     highline (1.7.10)
     hpricot (0.8.6)
     htmlcompressor (0.2.0)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jquery-middleman (3.1.2)
       thor (>= 0.14, < 2.0)
     json (2.1.0)
@@ -76,28 +77,26 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
     memoist (0.16.0)
     method_source (0.9.2)
-    middleman (4.2.1)
+    middleman (4.3.1)
       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 (= 4.3.1)
+      middleman-core (= 4.3.1)
     middleman-blog (4.0.2)
       addressable (~> 2.3)
       middleman-core (~> 4.0)
       tzinfo (>= 0.3.0)
-    middleman-cli (4.2.1)
+    middleman-cli (4.3.1)
       thor (>= 0.17.0, < 2.0)
     middleman-compass (4.0.1)
       compass (>= 1.0.0, < 2.0.0)
       middleman-core (>= 4.0.0)
-    middleman-core (4.2.1)
+    middleman-core (4.3.1)
       activesupport (>= 4.2, < 5.1)
       addressable (~> 2.3)
       backports (~> 3.6)
-      bundler (~> 1.1)
+      bundler
       contracts (~> 0.13.0)
       dotenv
       erubis
@@ -106,15 +105,15 @@ 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-minify-html (3.4.1)
       htmlcompressor (~> 0.2.0)
@@ -130,7 +129,7 @@ GEM
       middleman-core (>= 3.2)
       rouge (~> 2.0)
     mini_portile2 (2.4.0)
-    minitest (5.10.3)
+    minitest (5.11.3)
     multi_json (1.13.1)
     multipart-post (2.0.0)
     mustache (1.0.5)
@@ -146,7 +145,7 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.12.0)
+    parallel (1.12.1)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -159,9 +158,9 @@ GEM
       websocket (~> 1.0)
     rack (2.0.6)
     rake (12.3.2)
-    rb-fsevent (0.10.2)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rdiscount (2.2.0.1)
     ref (2.0.0)
     ronn (0.7.3)
@@ -184,9 +183,9 @@ GEM
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
-    thor (0.20.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.9)
     travis (1.8.9)
       backports
       faraday (~> 0.9)
@@ -198,7 +197,7 @@ GEM
       typhoeus (~> 0.6, >= 0.6.8)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
-    tzinfo (1.2.3)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -213,7 +212,7 @@ DEPENDENCIES
   haml (~> 5.0.4)
   jquery-middleman
   kramdown
-  middleman (~> 4.2)
+  middleman (~> 4.3)
   middleman-blog
   middleman-compass
   middleman-minify-html