diff --git a/.rubocop.yml b/.rubocop.yml
index 8fede7b..019c78d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -17,3 +17,10 @@ Style/IndentHeredoc:
   Enabled: false
 Style/FormatString:
   Enabled: false
+Style/GuardClause:
+  Enabled: false
+Style/PercentLiteralDelimiters: # Contradicting rule
+  Enabled: false
+Style/SymbolArray: # Undefined syntax in Ruby 1.9.3
+  Enabled: false
+
diff --git a/Rakefile b/Rakefile
index c4d4ffc..2c95e80 100755
--- a/Rakefile
+++ b/Rakefile
@@ -10,6 +10,6 @@ desc 'Run rake task'
 RSpec::Core::RakeTask.new(:spec)
 
 desc 'Does rubocop lint and runs the specs'
-task all: %i[rubocop spec]
+task all: [:rubocop, :spec]
 
 task default: :all
diff --git a/lib/googleauth/user_refresh.rb b/lib/googleauth/user_refresh.rb
index 4abe7a3..14c1990 100644
--- a/lib/googleauth/user_refresh.rb
+++ b/lib/googleauth/user_refresh.rb
@@ -75,7 +75,7 @@ module Google
       # JSON key.
       def self.read_json_key(json_key_io)
         json_key = MultiJson.load(json_key_io.read)
-        wanted = %w[client_id client_secret refresh_token]
+        wanted = %w(client_id client_secret refresh_token)
         wanted.each do |key|
           raise "the json is missing the #{key} field" unless json_key.key?(key)
         end
diff --git a/lib/googleauth/web_user_authorizer.rb b/lib/googleauth/web_user_authorizer.rb
index 9b09d06..cfe8eac 100644
--- a/lib/googleauth/web_user_authorizer.rb
+++ b/lib/googleauth/web_user_authorizer.rb
@@ -227,7 +227,7 @@ module Google
       # @param [Rack::Request] request
       #  Current request
       def self.validate_callback_state(state, request)
-        if state[AUTH_CODE_KEY].nil? # rubocop:disable Style/GuardClause
+        if state[AUTH_CODE_KEY].nil?
           raise Signet::AuthorizationError, MISSING_AUTH_CODE_ERROR
         elsif state[ERROR_CODE_KEY]
           raise Signet::AuthorizationError,
diff --git a/spec/googleauth/scope_util_spec.rb b/spec/googleauth/scope_util_spec.rb
index f401b9e..d69b820 100644
--- a/spec/googleauth/scope_util_spec.rb
+++ b/spec/googleauth/scope_util_spec.rb
@@ -70,7 +70,7 @@ describe Google::Auth::ScopeUtil do
 
   context 'with scope as Array' do
     let(:source) do
-      %w[email profile openid https://www.googleapis.com/auth/drive]
+      %w(email profile openid https://www.googleapis.com/auth/drive)
     end
     it_behaves_like 'normalizes scopes'
   end
diff --git a/spec/googleauth/user_authorizer_spec.rb b/spec/googleauth/user_authorizer_spec.rb
index d0bcfe2..5e8d62e 100644
--- a/spec/googleauth/user_authorizer_spec.rb
+++ b/spec/googleauth/user_authorizer_spec.rb
@@ -41,7 +41,7 @@ describe Google::Auth::UserAuthorizer do
   include TestHelpers
 
   let(:client_id) { Google::Auth::ClientId.new('testclient', 'notasecret') }
-  let(:scope) { %w[email profile] }
+  let(:scope) { %w(email profile) }
   let(:token_store) { DummyTokenStore.new }
   let(:callback_uri) { 'https://www.example.com/oauth/callback' }
   let(:authorizer) do
@@ -173,7 +173,7 @@ describe Google::Auth::UserAuthorizer do
       end
 
       it 'should return credentials with a valid scope' do
-        expect(credentials.scope).to eq %w[email profile]
+        expect(credentials.scope).to eq %w(email profile)
       end
 
       it 'should return credentials with a valid expiration time' do
diff --git a/spec/googleauth/user_refresh_spec.rb b/spec/googleauth/user_refresh_spec.rb
index a2bb059..d80f6ba 100644
--- a/spec/googleauth/user_refresh_spec.rb
+++ b/spec/googleauth/user_refresh_spec.rb
@@ -115,7 +115,7 @@ describe Google::Auth::UserRefreshCredentials do
     end
 
     it 'fails if the GOOGLE_APPLICATION_CREDENTIALS path file is invalid' do
-      needed = %w[client_id client_secret refresh_token]
+      needed = %w(client_id client_secret refresh_token)
       needed.each do |missing|
         Dir.mktmpdir do |dir|
           key_path = File.join(dir, 'my_cert_file')
@@ -169,7 +169,7 @@ describe Google::Auth::UserRefreshCredentials do
     end
 
     it 'fails if the file is invalid' do
-      needed = %w[client_id client_secret refresh_token]
+      needed = %w(client_id client_secret refresh_token)
       needed.each do |missing|
         Dir.mktmpdir do |dir|
           key_path = File.join(dir, '.config', @known_path)
@@ -208,7 +208,7 @@ describe Google::Auth::UserRefreshCredentials do
     end
 
     it 'fails if the file is invalid' do
-      needed = %w[client_id client_secret refresh_token]
+      needed = %w(client_id client_secret refresh_token)
       needed.each do |missing|
         FakeFS do
           FileUtils.mkdir_p(File.dirname(@path))
diff --git a/spec/googleauth/web_user_authorizer_spec.rb b/spec/googleauth/web_user_authorizer_spec.rb
index 939bb3f..04e30dd 100644
--- a/spec/googleauth/web_user_authorizer_spec.rb
+++ b/spec/googleauth/web_user_authorizer_spec.rb
@@ -42,7 +42,7 @@ describe Google::Auth::WebUserAuthorizer do
   include TestHelpers
 
   let(:client_id) { Google::Auth::ClientId.new('testclient', 'notasecret') }
-  let(:scope) { %w[email profile] }
+  let(:scope) { %w(email profile) }
   let(:token_store) { DummyTokenStore.new }
   let(:authorizer) do
     Google::Auth::WebUserAuthorizer.new(client_id, scope, token_store)