diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 6323724..3e0d254 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -13,13 +13,3 @@ Metrics/AbcSize:
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
   Max: 13
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Performance/ParallelAssignment:
-  Enabled: false
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/TrailingUnderscoreVariable:
-  Enabled: false
diff --git a/.travis.yml b/.travis.yml
index 939ced4..d479252 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+sudo: false
 language: ruby
 rvm:
   - 2.2
@@ -7,10 +8,24 @@ rvm:
   - rbx-2
   - jruby
 script: "bundle exec rake"
+addons:
+  apt:
+    packages:
+    - idn
+    - build-essential  # this and below attempt allow rubinius to be setup ok
+    - bison
+    - ruby-dev
+    - rake zlib1g-dev
+    - libyaml-dev
+    - libssl-dev
+    - libreadline-dev
+    - libncurses5-dev
+    - llvm
+    - llvm-dev
+    - libeditline-dev
+    - libedit-dev
 before_install:
  - gem update bundler
- - sudo apt-get update
- - sudo apt-get install idn
 notifications:
   email:
     recipients:
diff --git a/lib/googleauth/credentials_loader.rb b/lib/googleauth/credentials_loader.rb
index 04d5fc0..0e5dfdf 100644
--- a/lib/googleauth/credentials_loader.rb
+++ b/lib/googleauth/credentials_loader.rb
@@ -91,7 +91,8 @@ module Google
       #
       # @param scope [string|array|nil] the scope(s) to access
       def from_well_known_path(scope = nil)
-        home_var, base = windows? ? 'APPDATA' : 'HOME', WELL_KNOWN_PATH
+        home_var = windows? ? 'APPDATA' : 'HOME'
+        base = WELL_KNOWN_PATH
         root = ENV[home_var].nil? ? '' : ENV[home_var]
         base = File.join('.config', base) unless windows?
         path = File.join(root, base)
diff --git a/spec/googleauth/get_application_default_spec.rb b/spec/googleauth/get_application_default_spec.rb
index 13fe861..26eda35 100644
--- a/spec/googleauth/get_application_default_spec.rb
+++ b/spec/googleauth/get_application_default_spec.rb
@@ -71,10 +71,10 @@ describe '#get_application_default' do
            { 'Metadata-Flavor' => 'Google' },
            '']
         end
-      end  # GCE not detected
+      end # GCE not detected
       Dir.mktmpdir do |dir|
         ENV.delete(@var_name) unless ENV[@var_name].nil? # no env var
-        ENV['HOME'] = dir  # no config present in this tmp dir
+        ENV['HOME'] = dir # no config present in this tmp dir
         c = Faraday.new do |b|
           b.adapter(:test, stubs)
         end
@@ -127,10 +127,10 @@ describe '#get_application_default' do
            { 'Metadata-Flavor' => 'Google' },
            '']
         end
-      end  # GCE detected
+      end # GCE detected
       Dir.mktmpdir do |dir|
         ENV.delete(@var_name) unless ENV[@var_name].nil? # no env var
-        ENV['HOME'] = dir  # no config present in this tmp dir
+        ENV['HOME'] = dir # no config present in this tmp dir
         c = Faraday.new do |b|
           b.adapter(:test, stubs)
         end
diff --git a/spec/googleauth/service_account_spec.rb b/spec/googleauth/service_account_spec.rb
index ceda286..d8cf18f 100644
--- a/spec/googleauth/service_account_spec.rb
+++ b/spec/googleauth/service_account_spec.rb
@@ -54,7 +54,7 @@ shared_examples 'jwt header auth' do
       expect(hdr).to_not be_nil
       expect(hdr.start_with?(auth_prefix)).to be true
       authorization = hdr[auth_prefix.length..-1]
-      payload, _ = JWT.decode(authorization, @key.public_key)
+      payload, = JWT.decode(authorization, @key.public_key)
       expect(payload['aud']).to eq(test_uri)
       expect(payload['iss']).to eq(client_email)
     end