diff --git a/Gemfile b/Gemfile
index d66b47e..84591a0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'nokogiri'
+gem 'nokogiri', '>= 1.8.2'
 gem 'colorize'
 gem 'stopwords'
 gem 'json'
diff --git a/Gemfile.lock b/Gemfile.lock
index 65a2097..4bf06bd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,9 +3,9 @@ GEM
   specs:
     colorize (0.7.3)
     json (1.8.1)
-    mini_portile (0.6.0)
-    nokogiri (1.6.2.1)
-      mini_portile (= 0.6.0)
+    mini_portile2 (2.3.0)
+    nokogiri (1.8.2)
+      mini_portile2 (~> 2.3.0)
     stopwords (0.2)
 
 PLATFORMS
@@ -14,5 +14,8 @@ PLATFORMS
 DEPENDENCIES
   colorize
   json
-  nokogiri
+  nokogiri (>= 1.8.2)
   stopwords
+
+BUNDLED WITH
+   1.16.1