diff --git a/.travis.yml b/.travis.yml
index 1b14b5a..7ada8e3 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ rvm:
 - 2.1.5
 - 2.2.0
 - 2.3.0
-before_install: gem install bundler -v 1.11.2
+before_install: gem install bundler -v 1.14.1
 script:
 - bundle install && bundle exec rake test:unit
 deploy:
diff --git a/ChangeLog.md b/ChangeLog.md
index 46459c6..4d77d91 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,6 @@
+# 2017.08.18 - azure-core gem @version 0.1.11
+* Changed 'nokogiri' to runtime dependency with version >= 1.6, and added documentation to resolve dependency issue to Readme for users with Ruby version lower than 2.2.0.
+
 # 2017.08.10 - azure-core gem @version 0.1.10
 * Changed 'nokogiri' to dev dependency and added post-logic for Gem installation. [#41](https://github.com/Azure/azure-ruby-asm-core/pull/41)
 
diff --git a/README.md b/README.md
index cc83aca..989bffa 100755
--- a/README.md
+++ b/README.md
@@ -20,6 +20,9 @@ Or install it yourself as:
 
     $ gem install azure-core
 
+### Notice
+For ruby version >= 1.9.3 && < 2.2.0, please install compatible Nokogiri(version >= 1.6.8), otherwise the installation using old version of bundler or all version of rubygems will report failure.
+
 ## Usage
 ```ruby
  require 'azure/core'
diff --git a/azure-core.gemspec b/azure-core.gemspec
index 2ed0baa..60d4c53 100755
--- a/azure-core.gemspec
+++ b/azure-core.gemspec
@@ -26,12 +26,12 @@ Gem::Specification.new do |s|
   s.homepage    = 'http://github.com/Azure/azure-ruby-asm-core'
   s.license     = 'Apache License, Version 2.0'
   s.files       = `git ls-files`.split("\n").reject { |f|  f.start_with?("test/unit") }
-  s.extensions  = 'ext/mkrf_conf.rb'
 
   s.required_ruby_version = '>= 1.9.3'
 
   s.add_runtime_dependency('faraday',                 '~> 0.9')
   s.add_runtime_dependency('faraday_middleware',      '~> 0.10')
+  s.add_runtime_dependency('nokogiri',                '~> 1.6')
 
   s.add_development_dependency('dotenv',              '~> 2.0')
   s.add_development_dependency('minitest',            '~> 5')
@@ -40,11 +40,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rake',                '~> 10.0')
   s.add_development_dependency('timecop',             '~> 0.7')
   s.add_development_dependency('bundler',             '~> 1.11')
-  if RUBY_VERSION < "2.1.0"
-    s.add_development_dependency('nokogiri',          '~> 1.6.0')
-  elsif RUBY_VERSION < "2.2.0"
-    s.add_development_dependency('nokogiri',          '~> 1.7.0')
-  else
-    s.add_development_dependency('nokogiri',          '~> 1.8')
-  end
+
 end
diff --git a/ext/mkrf_conf.rb b/ext/mkrf_conf.rb
deleted file mode 100644
index 91c4a41..0000000
--- a/ext/mkrf_conf.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-require 'rubygems/dependency_installer'
- 
-dependency_installer = Gem::DependencyInstaller.new
- 
-begin
-  if RUBY_VERSION < '2.1.0'
-    puts "Installing nokogiri ~> 1.6.0 with Ruby version:#{RUBY_VERSION}"    
-    dependency_installer.install 'nokogiri', '~> 1.6.0'
-  elsif RUBY_VERSION < '2.2.0'
-    puts "Installing nokogiri ~> 1.7.0 with Ruby version:#{RUBY_VERSION}"
-    dependency_installer.install 'nokogiri', '~> 1.7.0'
-  else
-    puts "Installing nokogiri ~> 1.8 with Ruby version:#{RUBY_VERSION}"
-    dependency_installer.install 'nokogiri', '~> 1.8'
-  end
-rescue => e
-  warn "#{$0}: #{e}"
-  exit!
-end
\ No newline at end of file
diff --git a/lib/azure/core/version.rb b/lib/azure/core/version.rb
index 4ec00eb..e9a9ee1 100755
--- a/lib/azure/core/version.rb
+++ b/lib/azure/core/version.rb
@@ -18,7 +18,7 @@ module Core
     class Version
       MAJOR = 0 unless defined? MAJOR
       MINOR = 1 unless defined? MINOR
-      UPDATE = 10 unless defined? UPDATE
+      UPDATE = 11 unless defined? UPDATE
       PRE = nil unless defined? PRE
 
       class << self