diff --git a/README.md b/README.md
index 5119aef..ad3d52b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Google Auth Library for Ruby 
+# Google Auth Library for Ruby
 
 <dl>
   <dt>Homepage</dt><dd><a href="http://www.github.com/google/google-auth-library-ruby">http://www.github.com/google/google-auth-library-ruby</a></dd>
@@ -7,6 +7,7 @@
   <dt>License</dt><dd>Apache 2.0</dd>
 </dl>
 
+[![Gem Version](https://badge.fury.io/rb/googleauth.svg)](http://badge.fury.io/rb/googleauth)
 [![Build Status](https://secure.travis-ci.org/google/google-auth-library-ruby.png)](http://travis-ci.org/google/google-auth-library-ruby)
 [![Coverage Status](https://coveralls.io/repos/google/google-auth-library-ruby/badge.png)](https://coveralls.io/r/google/google-auth-library-ruby)
 [![Dependency Status](https://gemnasium.com/google/google-auth-library-ruby.png)](https://gemnasium.com/google/google-auth-library-ruby)
diff --git a/googleauth.gemspec b/googleauth.gemspec
index 7cc20b4..c4ca4bc 100755
--- a/googleauth.gemspec
+++ b/googleauth.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'faraday', '~> 0.9'
   s.add_dependency 'logging', '~> 1.8'
-  s.add_dependency 'jwt', '~> 1.3.0'
+  s.add_dependency 'jwt', '~> 1.4.1'
   s.add_dependency 'memoist', '~> 0.11.0'
   s.add_dependency 'multi_json', '1.11.0'
   s.add_dependency 'signet', '~> 0.6.0'
@@ -36,6 +36,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'simplecov', '~> 0.9.2'
   s.add_development_dependency 'coveralls', '~> 0.7.11'
   s.add_development_dependency 'rake', '~> 10.0'
-  s.add_development_dependency 'rubocop', '~> 0.28.0'
+  s.add_development_dependency 'rubocop', '~> 0.29.1'
   s.add_development_dependency 'rspec', '~> 3.0'
 end
diff --git a/spec/googleauth/compute_engine_spec.rb b/spec/googleauth/compute_engine_spec.rb
index 5b5ba06..95785cd 100644
--- a/spec/googleauth/compute_engine_spec.rb
+++ b/spec/googleauth/compute_engine_spec.rb
@@ -51,9 +51,9 @@ describe Google::Auth::GCECredentials do
         headers = env[:request_headers]
         expect(headers['Metadata-Flavor']).to eq('Google')
         build_json_response(
-            'access_token' => access_token,
-            'token_type' => 'Bearer',
-            'expires_in' => 3600)
+          'access_token' => access_token,
+          'token_type' => 'Bearer',
+          'expires_in' => 3600)
       end
     end
   end
diff --git a/spec/googleauth/service_account_spec.rb b/spec/googleauth/service_account_spec.rb
index caaa878..108e2b0 100644
--- a/spec/googleauth/service_account_spec.rb
+++ b/spec/googleauth/service_account_spec.rb
@@ -47,8 +47,8 @@ describe Google::Auth::ServiceAccountCredentials do
   before(:example) do
     @key = OpenSSL::PKey::RSA.new(2048)
     @client = ServiceAccountCredentials.new(
-        StringIO.new(cred_json_text),
-        'https://www.googleapis.com/auth/userinfo.profile')
+      StringIO.new(cred_json_text),
+      'https://www.googleapis.com/auth/userinfo.profile')
   end
 
   def make_auth_stubs(opts = {})
diff --git a/spec/googleauth/signet_spec.rb b/spec/googleauth/signet_spec.rb
index de02d16..60da4fd 100644
--- a/spec/googleauth/signet_spec.rb
+++ b/spec/googleauth/signet_spec.rb
@@ -41,11 +41,11 @@ describe Signet::OAuth2::Client do
   before(:example) do
     @key = OpenSSL::PKey::RSA.new(2048)
     @client = Signet::OAuth2::Client.new(
-        token_credential_uri: 'https://accounts.google.com/o/oauth2/token',
-        scope: 'https://www.googleapis.com/auth/userinfo.profile',
-        issuer: 'app@example.com',
-        audience: 'https://accounts.google.com/o/oauth2/token',
-        signing_key: @key
+      token_credential_uri: 'https://accounts.google.com/o/oauth2/token',
+      scope: 'https://www.googleapis.com/auth/userinfo.profile',
+      issuer: 'app@example.com',
+      audience: 'https://accounts.google.com/o/oauth2/token',
+      signing_key: @key
       )
   end
 
diff --git a/spec/googleauth/user_refresh_spec.rb b/spec/googleauth/user_refresh_spec.rb
index eced027..0765f87 100644
--- a/spec/googleauth/user_refresh_spec.rb
+++ b/spec/googleauth/user_refresh_spec.rb
@@ -47,8 +47,8 @@ describe Google::Auth::UserRefreshCredentials do
   before(:example) do
     @key = OpenSSL::PKey::RSA.new(2048)
     @client = UserRefreshCredentials.new(
-        StringIO.new(cred_json_text),
-        'https://www.googleapis.com/auth/userinfo.profile')
+      StringIO.new(cred_json_text),
+      'https://www.googleapis.com/auth/userinfo.profile')
   end
 
   def make_auth_stubs(opts = {})