diff --git a/Gemfile.lock b/Gemfile.lock
index 42e70c1..f5b1998 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ PATH
       addressable
       bundler
       diff-lcs
-      draper (~> 1.3)
+      draper (~> 2.1)
       fluentd (>= 0.10.56, < 0.14)
       font-awesome-rails
       haml-rails (~> 1.0)
@@ -107,7 +107,7 @@ GEM
     docile (1.3.0)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
-    draper (1.4.0)
+    draper (2.1.0)
       actionpack (>= 3.0)
       activemodel (>= 3.0)
       activesupport (>= 3.0)
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 1527c3f..c46f473 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "haml-rails", "~> 1.0"
   spec.add_dependency 'jquery-rails', "~> 4.3.1"
   spec.add_dependency 'jbuilder', '~> 2.0'
-  spec.add_dependency "draper", '~> 1.3'
+  spec.add_dependency "draper", '~> 2.1'
   spec.add_dependency "bundler"
   spec.add_dependency "httpclient", "~> 2.5" # same as td-agent
   spec.add_dependency "settingslogic"