diff --git a/Gemfile b/Gemfile
index 3eb7465d..c6cd7a50 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,9 @@
 source 'https://rubygems.org'
 
 # rails-assets requires >= 1.8.4
-gem 'bundler', '>= 1.8.4'
+if Gem::Version.new(Bundler::VERSION) < Gem::Version.new('1.8.4')
+  abort "Bundler version >= 1.8.4 is required"
+end
 
 # as web framework
 gem 'rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index e8700d76..f9ad33e9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -506,7 +506,6 @@ DEPENDENCIES
   bootstrap-sass (~> 3.3.4.1)
   bootstrap-switch-rails (~> 3.0.0)
   bootstrap3-datetimepicker-rails (~> 3.0.2)
-  bundler (>= 1.8.4)
   byebug
   cancancan
   capybara