diff --git a/Gemfile b/Gemfile
index e189ae1..22194d6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem 'builder', '~> 3.2'
 gem 'css_parser', '~> 1.3'
 gem 'htmlentities', '~> 4.3'
 gem 'mustache', '~> 1.0'
-gem 'nokogiri', '~> 1.6.6'
+gem 'nokogiri', '~> 1.8'
 gem 'rdiscount', '~> 2.1'
 gem 'sinatra', '~> 1.4'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 34c0417..aff0418 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,19 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     builder (3.2.3)
-    coderay (1.1.1)
-    css_parser (1.5.0)
+    coderay (1.1.2)
+    css_parser (1.6.0)
       addressable
     diff-lcs (1.3)
     ffi (1.9.18)
     formatador (0.2.5)
-    guard (2.14.1)
+    guard (2.14.2)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
-      lumberjack (~> 1.0)
+      lumberjack (>= 1.0.12, < 2.0)
       nenv (~> 0.1)
       notiffany (~> 0.0)
       pry (>= 0.9.12)
@@ -30,49 +30,47 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     lumberjack (1.0.12)
-    method_source (0.8.2)
-    mini_portile2 (2.1.0)
+    method_source (0.9.0)
+    mini_portile2 (2.3.0)
     mustache (1.0.5)
     nenv (0.3.0)
-    nokogiri (1.6.8.1)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    pry (0.10.4)
+    pry (0.11.3)
       coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    public_suffix (2.0.5)
+      method_source (~> 0.9.0)
+    public_suffix (3.0.1)
     rack (1.6.8)
     rack-protection (1.5.3)
       rack
-    rb-fsevent (0.9.8)
-    rb-inotify (0.9.8)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rdiscount (2.2.0.1)
-    rspec (3.6.0)
-      rspec-core (~> 3.6.0)
-      rspec-expectations (~> 3.6.0)
-      rspec-mocks (~> 3.6.0)
-    rspec-core (3.6.0)
-      rspec-support (~> 3.6.0)
-    rspec-expectations (3.6.0)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-mocks (3.6.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-support (3.6.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.0)
     ruby_dep (1.5.0)
     shellany (0.0.1)
     sinatra (1.4.8)
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    slop (3.6.0)
-    thor (0.19.4)
-    tilt (2.0.7)
+    thor (0.20.0)
+    tilt (2.0.8)
 
 PLATFORMS
   ruby
@@ -83,10 +81,10 @@ DEPENDENCIES
   guard-rspec (~> 4.6)
   htmlentities (~> 4.3)
   mustache (~> 1.0)
-  nokogiri (~> 1.6.6)
+  nokogiri (~> 1.8)
   rdiscount (~> 2.1)
   rspec (~> 3.3)
   sinatra (~> 1.4)
 
 BUNDLED WITH
-   1.14.6
+   1.16.1