diff --git a/Gemfile.lock b/Gemfile.lock
index 6f3efb4..0a3682f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,8 +27,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    commonmarker (0.18.1)
-      ruby-enum (~> 0.5)
+    commonmarker (0.23.9)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -74,35 +73,35 @@ GEM
       concurrent-ruby (~> 1.0)
     hashie (3.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.7.0)
-    kramdown (1.17.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    kramdown (2.4.0)
+      rexml
     libv8 (3.16.14.19)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     memoist (0.16.0)
     method_source (0.9.2)
-    middleman (4.2.1)
+    middleman (4.3.11)
       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 (= 4.3.11)
+      middleman-core (= 4.3.11)
     middleman-autoprefixer (2.7.1)
       autoprefixer-rails (>= 6.5.2, < 7.0.0)
       middleman-core (>= 3.3.3)
-    middleman-cli (4.2.1)
+    middleman-cli (4.3.11)
       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)
-      activesupport (>= 4.2, < 5.1)
+    middleman-core (4.3.11)
+      activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
       backports (~> 3.6)
-      bundler (~> 1.1)
+      bundler
       contracts (~> 0.13.0)
       dotenv
       erubis
@@ -111,15 +110,15 @@ 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-livereload (3.4.6)
       em-websocket (~> 0.5.1)
@@ -157,10 +156,11 @@ GEM
       ffi (>= 0.5.0, < 2)
     redcarpet (3.3.4)
     ref (2.0.0)
+    rexml (3.2.5)
     rouge (2.2.1)
-    ruby-enum (0.7.2)
-      i18n
     sass (3.4.25)
+    sassc (2.4.0)
+      ffi (~> 1.9)
     servolux (0.13.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -171,7 +171,7 @@ GEM
       ref
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.11)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (3.2.0)