diff --git a/Gemfile b/Gemfile
index 1481b28..5c14b14 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.0.0-p247'
 gem 'nokogiri'
 gem 'mechanize'
 gem 'rake'
-gem 'rack', '~>1.1'
+gem 'rack', '~>1.6'
 gem 'rspec', :require => 'spec'
 
 gem 'java'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0719df6..8fe377f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    java (0.0.2)
     mechanize (1.0.0)
       nokogiri (>= 1.2.1)
     mini_portile (0.5.2)
@@ -8,7 +9,7 @@ GEM
       mini_portile (~> 0.5.0)
     nokogiri (1.6.0-java)
       mini_portile (~> 0.5.0)
-    rack (1.5.2)
+    rack (1.6.12)
     rake (10.1.0)
     rspec (1.3.2)
     ruby-processing (2.6.7)
@@ -18,9 +19,10 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  java
   mechanize
   nokogiri
-  rack (~> 1.1)
+  rack (~> 1.6)
   rake
   rspec
   ruby-processing