diff --git a/Gemfile.lock b/Gemfile.lock
index ea7644e..4bed524 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ PATH
       kramdown (> 1.0.0)
       kramdown-haml
       puma
-      rails (~> 5.0.0)
+      rails (~> 5.1.0)
       rubyzip (~> 1.1)
       sass-rails (~> 5.0.7)
       settingslogic
@@ -25,50 +25,50 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.0.7)
-      actionpack (= 5.0.7)
-      nio4r (>= 1.2, < 3.0)
+    actioncable (5.1.6)
+      actionpack (= 5.1.6)
+      nio4r (~> 2.0)
       websocket-driver (~> 0.6.1)
-    actionmailer (5.0.7)
-      actionpack (= 5.0.7)
-      actionview (= 5.0.7)
-      activejob (= 5.0.7)
+    actionmailer (5.1.6)
+      actionpack (= 5.1.6)
+      actionview (= 5.1.6)
+      activejob (= 5.1.6)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.0.7)
-      actionview (= 5.0.7)
-      activesupport (= 5.0.7)
+    actionpack (5.1.6)
+      actionview (= 5.1.6)
+      activesupport (= 5.1.6)
       rack (~> 2.0)
-      rack-test (~> 0.6.3)
+      rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.0.7)
-      activesupport (= 5.0.7)
+    actionview (5.1.6)
+      activesupport (= 5.1.6)
       builder (~> 3.1)
-      erubis (~> 2.7.0)
+      erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.0.7)
-      activesupport (= 5.0.7)
+    activejob (5.1.6)
+      activesupport (= 5.1.6)
       globalid (>= 0.3.6)
-    activemodel (5.0.7)
-      activesupport (= 5.0.7)
+    activemodel (5.1.6)
+      activesupport (= 5.1.6)
     activemodel-serializers-xml (1.0.2)
       activemodel (> 5.x)
       activesupport (> 5.x)
       builder (~> 3.1)
-    activerecord (5.0.7)
-      activemodel (= 5.0.7)
-      activesupport (= 5.0.7)
-      arel (~> 7.0)
-    activesupport (5.0.7)
+    activerecord (5.1.6)
+      activemodel (= 5.1.6)
+      activesupport (= 5.1.6)
+      arel (~> 8.0)
+    activesupport (5.1.6)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    arel (7.1.4)
+    arel (8.0.0)
     better_errors (2.1.1)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
@@ -101,6 +101,7 @@ GEM
       activemodel-serializers-xml (~> 1.0)
       activesupport (~> 5.0)
       request_store (~> 1.0)
+    erubi (1.7.1)
     erubis (2.7.0)
     factory_bot (4.8.2)
       activesupport (>= 3.0.0)
@@ -179,28 +180,28 @@ GEM
     public_suffix (3.0.2)
     puma (3.11.4)
     rack (2.0.4)
-    rack-test (0.6.3)
-      rack (>= 1.0)
-    rails (5.0.7)
-      actioncable (= 5.0.7)
-      actionmailer (= 5.0.7)
-      actionpack (= 5.0.7)
-      actionview (= 5.0.7)
-      activejob (= 5.0.7)
-      activemodel (= 5.0.7)
-      activerecord (= 5.0.7)
-      activesupport (= 5.0.7)
+    rack-test (1.0.0)
+      rack (>= 1.0, < 3)
+    rails (5.1.6)
+      actioncable (= 5.1.6)
+      actionmailer (= 5.1.6)
+      actionpack (= 5.1.6)
+      actionview (= 5.1.6)
+      activejob (= 5.1.6)
+      activemodel (= 5.1.6)
+      activerecord (= 5.1.6)
+      activesupport (= 5.1.6)
       bundler (>= 1.3.0)
-      railties (= 5.0.7)
+      railties (= 5.1.6)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    railties (5.0.7)
-      actionpack (= 5.0.7)
-      activesupport (= 5.0.7)
+    railties (5.1.6)
+      actionpack (= 5.1.6)
+      activesupport (= 5.1.6)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
@@ -284,7 +285,7 @@ GEM
       hashdiff
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.2)
+    websocket-extensions (0.1.3)
     xpath (3.0.0)
       nokogiri (~> 1.8)
     yajl-ruby (1.3.1)
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 1e0c066..cf3c536 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", [">= 0.10.56", "< 0.14"]
-  spec.add_dependency 'rails', '~> 5.0.0'
+  spec.add_dependency 'rails', '~> 5.1.0'
   spec.add_dependency 'sucker_punch', "~> 2.0.4"
   spec.add_dependency 'addressable'
   spec.add_dependency "font-awesome-rails"