diff --git a/.travis.yml b/.travis.yml
index 323df40..8fe83fa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: ruby
 before_install:
   - gem install bundler
 rvm:
-  - 2.1.1
-  - 2.2.5
-  - 2.3.0
-  - 2.4.0
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.1
diff --git a/lib/wx_pay/version.rb b/lib/wx_pay/version.rb
index 23995ab..7435970 100644
--- a/lib/wx_pay/version.rb
+++ b/lib/wx_pay/version.rb
@@ -1,3 +1,3 @@
 module WxPay
-  VERSION = '0.18.0'.freeze
+  VERSION = '0.19.0'.freeze
 end
diff --git a/wx_pay.gemspec b/wx_pay.gemspec
index 887933a..2a19f84 100644
--- a/wx_pay.gemspec
+++ b/wx_pay.gemspec
@@ -20,7 +20,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency "rest-client", '>= 2.0.0'
   s.add_runtime_dependency "activesupport", '>= 3.2'
 
-  s.add_development_dependency "bundler", '~> 1'
   s.add_development_dependency "rake", '~> 11.2'
   s.add_development_dependency "webmock", '~> 2.3'
   s.add_development_dependency "minitest", '~> 5'
--
libgit2 0.21.0