diff --git a/.gitignore b/.gitignore
index 60afa01..e6d7e92 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@
 *.a
 mkmf.log
 *.swp
+.rbenv-gemsets
+.ruby-version
diff --git a/.travis.yml b/.travis.yml
index c8866d2..aa8e416 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,12 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.3
-  - 2.1.4
   - 2.1.5
+  - 2.2.5
+  - 2.3.5
+  - 2.4.5
+  - 2.5.0
+  - 2.5.3
+  - 2.6.0
 bundler_args: --jobs=2
 script: bundle exec rspec
 branches:
diff --git a/lib/store_api/version.rb b/lib/store_api/version.rb
index 869712e..bb16dff 100644
--- a/lib/store_api/version.rb
+++ b/lib/store_api/version.rb
@@ -1,3 +1,3 @@
 module StoreApi
-  VERSION = "0.2.2"
+  VERSION = "0.3.0"
 end
diff --git a/store_api.gemspec b/store_api.gemspec
index 4a0b44e..52edda0 100644
--- a/store_api.gemspec
+++ b/store_api.gemspec
@@ -23,5 +23,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "yard"
   spec.add_development_dependency 'simplecov', '~> 0.9.2'
-  spec.add_development_dependency "nokogiri", "~> 1.6.6.2"
+  spec.add_runtime_dependency "nokogiri", '~> 1.9', '>= 1.9.1'
 end