diff --git a/Gemfile.lock b/Gemfile.lock
index 94b7eda..4544f18 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ PATH
       kramdown (> 1.0.0)
       kramdown-haml
       puma
-      rails (= 4.1.4)
+      rails (~> 4.1.7)
       rubyzip (~> 1.1)
       sass-rails (~> 4.0.3)
       settingslogic
@@ -24,27 +24,27 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.1.4)
-      actionpack (= 4.1.4)
-      actionview (= 4.1.4)
-      mail (~> 2.5.4)
-    actionpack (4.1.4)
-      actionview (= 4.1.4)
-      activesupport (= 4.1.4)
+    actionmailer (4.1.7)
+      actionpack (= 4.1.7)
+      actionview (= 4.1.7)
+      mail (~> 2.5, >= 2.5.4)
+    actionpack (4.1.7)
+      actionview (= 4.1.7)
+      activesupport (= 4.1.7)
       rack (~> 1.5.2)
       rack-test (~> 0.6.2)
-    actionview (4.1.4)
-      activesupport (= 4.1.4)
+    actionview (4.1.7)
+      activesupport (= 4.1.7)
       builder (~> 3.1)
       erubis (~> 2.7.0)
-    activemodel (4.1.4)
-      activesupport (= 4.1.4)
+    activemodel (4.1.7)
+      activesupport (= 4.1.7)
       builder (~> 3.1)
-    activerecord (4.1.4)
-      activemodel (= 4.1.4)
-      activesupport (= 4.1.4)
+    activerecord (4.1.7)
+      activemodel (= 4.1.7)
+      activesupport (= 4.1.7)
       arel (~> 5.0.0)
-    activesupport (4.1.4)
+    activesupport (4.1.7)
       i18n (~> 0.6, >= 0.6.9)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
@@ -118,20 +118,19 @@ GEM
     kramdown (1.5.0)
     kramdown-haml (0.0.3)
       haml
-    mail (2.5.4)
-      mime-types (~> 1.16)
-      treetop (~> 1.4.8)
-    mechanize (2.7.2)
+    mail (2.6.3)
+      mime-types (>= 1.16, < 3)
+    mechanize (2.7.3)
       domain_name (~> 0.5, >= 0.5.1)
-      http-cookie (~> 1.0.0)
-      mime-types (~> 1.17, >= 1.17.2)
+      http-cookie (~> 1.0)
+      mime-types (~> 2.0)
       net-http-digest_auth (~> 1.1, >= 1.1.1)
       net-http-persistent (~> 2.5, >= 2.5.2)
       nokogiri (~> 1.4)
       ntlm-http (~> 0.1, >= 0.1.1)
       webrobots (>= 0.0.9, < 0.2)
     method_source (0.8.2)
-    mime-types (1.25.1)
+    mime-types (2.4.3)
     mini_portile (0.6.0)
     minitest (5.4.2)
     msgpack (0.5.9)
@@ -146,7 +145,6 @@ GEM
       cliver (~> 0.3.1)
       multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
-    polyglot (0.3.5)
     pry (0.10.1)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
@@ -156,19 +154,19 @@ GEM
     rack (1.5.2)
     rack-test (0.6.2)
       rack (>= 1.0)
-    rails (4.1.4)
-      actionmailer (= 4.1.4)
-      actionpack (= 4.1.4)
-      actionview (= 4.1.4)
-      activemodel (= 4.1.4)
-      activerecord (= 4.1.4)
-      activesupport (= 4.1.4)
+    rails (4.1.7)
+      actionmailer (= 4.1.7)
+      actionpack (= 4.1.7)
+      actionview (= 4.1.7)
+      activemodel (= 4.1.7)
+      activerecord (= 4.1.7)
+      activesupport (= 4.1.7)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.1.4)
+      railties (= 4.1.7)
       sprockets-rails (~> 2.0)
-    railties (4.1.4)
-      actionpack (= 4.1.4)
-      activesupport (= 4.1.4)
+    railties (4.1.7)
+      actionpack (= 4.1.7)
+      activesupport (= 4.1.7)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (10.3.2)
@@ -219,9 +217,6 @@ GEM
     tilt (1.4.1)
     timecop (0.7.1)
     timers (1.1.0)
-    treetop (1.4.15)
-      polyglot
-      polyglot (>= 0.3.1)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     tzinfo-data (1.2014.9)
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 5dbd535..39f4e1f 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "fluentd", "~> 0.10.51"
-  spec.add_dependency 'rails', '4.1.4'
+  spec.add_dependency 'rails', '~> 4.1.7'
   spec.add_dependency 'sucker_punch', "~> 1.0.5"
   spec.add_dependency 'addressable'
   spec.add_dependency "font-awesome-rails"