diff --git a/Gemfile.lock b/Gemfile.lock
index e1e6ce5..4071e6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ PATH
     fluentd-ui (0.0.1.pre)
       addressable
       bcrypt (~> 3.1.5)
-      bundler (~> 1.5)
+      bundler
       coffee-rails (~> 4.0.0)
       fluentd (~> 0.10.48)
       font-awesome-rails
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 63b99fb..d6563ae 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "haml-rails", "~> 0.5.3"
   spec.add_dependency 'jquery-rails', "~> 3.1.0"
   spec.add_dependency 'jbuilder', '~> 2.0'
-  spec.add_dependency "bundler", "~> 1.5"
+  spec.add_dependency "bundler"
   spec.add_dependency "httpclient"
 
 end