diff --git a/Gemfile b/Gemfile
index 9faaa71..3e99f3e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 source 'https://rubygems.org'
 
-gem 'nanoc', '4.3.5'
+gem 'nanoc', '4.3.7'
 gem 'kramdown'
 gem 'coffee-script'
 gem 'sass'
diff --git a/Gemfile.lock b/Gemfile.lock
index bcc434d..41b9c15 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     adsf (1.2.1)
       rack (>= 1.0.0)
-    autoprefixer-rails (6.5.0.1)
+    autoprefixer-rails (6.5.1.1)
       execjs
     builder (3.2.2)
     coderay (1.1.1)
@@ -45,28 +45,28 @@ GEM
     lumberjack (1.0.10)
     method_source (0.8.2)
     mini_portile2 (2.1.0)
-    nanoc (4.3.5)
+    nanoc (4.3.7)
       cri (~> 2.3)
       hamster (~> 3.0)
+      parallel (~> 1.9)
       ref (~> 2.0)
     nenv (0.3.0)
-    nokogiri (1.6.8)
+    nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    pkg-config (1.1.7)
+    parallel (1.9.0)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
     rack (2.0.1)
-    rb-fsevent (0.9.7)
+    rb-fsevent (0.9.8)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
     ref (2.0.0)
-    ruby_dep (1.4.0)
+    ruby_dep (1.5.0)
     sass (3.4.22)
     shellany (0.0.1)
     slop (3.6.0)
@@ -88,7 +88,7 @@ DEPENDENCIES
   highline
   icalendar
   kramdown
-  nanoc (= 4.3.5)
+  nanoc (= 4.3.7)
   sass
   terminal-notifier-guard
   w3c_validators