diff --git a/Gemfile b/Gemfile
index 79fc23f..70fd7e2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,6 +10,6 @@ gem "tlsmail"
 gem "open4"
 
 group :test do
-  gem 'nokogiri', '~> 1.4.7' # for ruby 1.8.6
+  gem 'nokogiri', '~> 1.18.9' # for ruby 1.8.6
   gem "capybara"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 94d9fec..55e6d2a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,7 @@
 GEM
   remote: http://rubygems.org/
   specs:
+    base64 (0.3.0)
     capybara (1.0.1)
       mime-types (>= 1.16)
       nokogiri (>= 1.3.3)
@@ -8,39 +9,54 @@ GEM
       rack-test (>= 0.5.4)
       selenium-webdriver (~> 2.0)
       xpath (~> 0.1.4)
-    childprocess (0.2.1)
-      ffi (~> 1.0.6)
-    ffi (1.0.9)
-    i18n (0.6.0)
-    json (1.5.3)
+    childprocess (5.1.0)
+      logger (~> 1.5)
+    concurrent-ruby (1.3.6)
+    ffi (1.9.24)
+    i18n (1.14.8)
+      concurrent-ruby (~> 1.0)
+    json (2.3.0)
     json_pure (1.5.3)
-    mail (2.3.0)
+    logger (1.7.0)
+    mail (2.4.4)
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    mime-types (1.16)
+    mime-types (1.25.1)
+    mini_portile2 (2.8.9)
     mustache (0.99.4)
-    nokogiri (1.4.7)
+    mustermann (3.0.4)
+      ruby2_keywords (~> 0.0.1)
+    nokogiri (1.18.9)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     open4 (1.1.0)
-    polyglot (0.3.2)
+    polyglot (0.3.5)
     pony (1.3)
       mail (> 2.0)
-    rack (1.3.2)
+    racc (1.8.1)
+    rack (2.2.20)
+    rack-protection (3.2.0)
+      base64 (>= 0.1.0)
+      rack (~> 2.2, >= 2.2.4)
     rack-test (0.6.1)
       rack (>= 1.0)
-    rake (0.9.2)
-    rubyzip (0.9.4)
+    rake (12.3.3)
+    ruby2_keywords (0.0.5)
+    rubyzip (1.3.0)
     selenium-webdriver (2.4.0)
       childprocess (>= 0.2.1)
       ffi (>= 1.0.7)
       json_pure
       rubyzip
-    sinatra (1.2.6)
-      rack (~> 1.1)
-      tilt (< 2.0, >= 1.2.2)
-    tilt (1.3.2)
+    sinatra (3.2.0)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.2.0)
+      tilt (~> 2.0)
+    tilt (2.6.1)
     tlsmail (0.0.1)
-    treetop (1.4.10)
+    treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
     xpath (0.1.4)
@@ -53,7 +69,7 @@ DEPENDENCIES
   capybara
   json
   mustache
-  nokogiri (~> 1.4.7)
+  nokogiri (~> 1.18.9)
   open4
   pony
   rack