diff --git a/examples/scopes/scopes.rb b/examples/scopes/scopes.rb
index adec506b..f24c8b6f 100644
--- a/examples/scopes/scopes.rb
+++ b/examples/scopes/scopes.rb
@@ -1,4 +1,4 @@
-require_relative '../../lib/sendgrid-ruby.rb'
+require_relative '../../lib/sendgrid-ruby'
 sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
 
 ##################################################
diff --git a/lib/sendgrid/base_interface.rb b/lib/sendgrid/base_interface.rb
index c288e632..01dadce1 100644
--- a/lib/sendgrid/base_interface.rb
+++ b/lib/sendgrid/base_interface.rb
@@ -5,6 +5,7 @@
 class BaseInterface
   attr_accessor :client
   attr_reader :request_headers, :host, :version, :impersonate_subuser
+
   # * *Args* :
   #   - +auth+ -> authorization header value
   #   - +host+ -> the base URL for the API
diff --git a/lib/sendgrid/helpers/inbound/app.rb b/lib/sendgrid/helpers/inbound/app.rb
index fa9f188d..9ccc6ccb 100644
--- a/lib/sendgrid/helpers/inbound/app.rb
+++ b/lib/sendgrid/helpers/inbound/app.rb
@@ -18,7 +18,7 @@
 class Main < Sinatra::Base
   configure :production, :development do
     enable :logging
-    set :config, YAML.load_file(File.dirname(__FILE__) + '/config.yml')
+    set :config, YAML.load_file("#{File.dirname(__FILE__)}/config.yml")
   end
 
   get '/' do
diff --git a/lib/sendgrid/helpers/inbound/send.rb b/lib/sendgrid/helpers/inbound/send.rb
index 5085a0e3..e6818d77 100644
--- a/lib/sendgrid/helpers/inbound/send.rb
+++ b/lib/sendgrid/helpers/inbound/send.rb
@@ -8,7 +8,7 @@
 opt = OptionParser.new
 opt.on('--host=HOST') { |v| OPTS[:host] = v }
 argv = opt.parse!(ARGV)
-config = YAML.load_file(File.dirname(__FILE__) + '/config.yml')
+config = YAML.load_file("#{File.dirname(__FILE__)}/config.yml")
 host = OPTS[:host] || config['host']
 client = SendGrid::Client.new(host: host)
 File.open(argv[0]) do |file|
diff --git a/lib/sendgrid/helpers/mail/tracking_settings.rb b/lib/sendgrid/helpers/mail/tracking_settings.rb
index acc6fdce..9ea9a99a 100644
--- a/lib/sendgrid/helpers/mail/tracking_settings.rb
+++ b/lib/sendgrid/helpers/mail/tracking_settings.rb
@@ -3,6 +3,7 @@
 module SendGrid
   class TrackingSettings
     attr_writer :click_tracking, :open_tracking, :subscription_tracking, :ganalytics
+
     def initialize
       @click_tracking = nil
       @open_tracking = nil
diff --git a/lib/sendgrid/helpers/permissions/scope.rb b/lib/sendgrid/helpers/permissions/scope.rb
index c7bd3ba9..5edff04d 100644
--- a/lib/sendgrid/helpers/permissions/scope.rb
+++ b/lib/sendgrid/helpers/permissions/scope.rb
@@ -3,7 +3,7 @@
 
 module SendGrid
   class Scope
-    SCOPES = YAML.load_file(File.dirname(__FILE__) + '/scopes.yml').freeze
+    SCOPES = YAML.load_file("#{File.dirname(__FILE__)}/scopes.yml").freeze
 
     class << self
       def admin_permissions
diff --git a/spec/fixtures/event_webhook.rb b/spec/fixtures/event_webhook.rb
index 9195129c..e0701c2c 100644
--- a/spec/fixtures/event_webhook.rb
+++ b/spec/fixtures/event_webhook.rb
@@ -7,7 +7,7 @@ module EventWebhook
     SIGNATURE = 'MEUCIGHQVtGj+Y3LkG9fLcxf3qfI10QysgDWmMOVmxG0u6ZUAiEAyBiXDWzM+uOe5W0JuG+luQAbPIqHh89M15TluLtEZtM='.freeze
     FAILING_SIGNATURE = 'MEUCIQCtIHJeH93Y+qpYeWrySphQgpNGNr/U+UyUlBkU6n7RAwIgJTz2C+8a8xonZGi6BpSzoQsbVRamr2nlxFDWYNH3j/0='.freeze
     TIMESTAMP = '1600112502'.freeze
-    PAYLOAD = [
+    PAYLOAD = "#{[
       {
         email: 'hello@world.com',
         event: 'dropped',
@@ -17,6 +17,6 @@ module EventWebhook
         'smtp-id': '<LRzXl_NHStOGhQ4kofSm_A@ismtpd0039p1iad1.sendgrid.net>',
         timestamp: 1_600_112_492
       }
-    ].to_json + "\r\n" # Be sure to include the trailing carriage return and newline!
+    ].to_json}\r\n".freeze # Be sure to include the trailing carriage return and newline!
   end
 end
diff --git a/spec/sendgrid/helpers/eventwebhook/eventwebhook_spec.rb b/spec/sendgrid/helpers/eventwebhook/eventwebhook_spec.rb
index 1d928e82..ec0dd4b9 100644
--- a/spec/sendgrid/helpers/eventwebhook/eventwebhook_spec.rb
+++ b/spec/sendgrid/helpers/eventwebhook/eventwebhook_spec.rb
@@ -78,7 +78,7 @@
             Fixtures::EventWebhook::SIGNATURE,
             Fixtures::EventWebhook::TIMESTAMP
           )
-        end .to raise_error(SendGrid::EventWebhook::NotSupportedError)
+        end.to raise_error(SendGrid::EventWebhook::NotSupportedError)
       end
     end
   end
diff --git a/test/sendgrid/permissions/test_scopes.rb b/test/sendgrid/permissions/test_scopes.rb
index a299ce25..37896fa2 100644
--- a/test/sendgrid/permissions/test_scopes.rb
+++ b/test/sendgrid/permissions/test_scopes.rb
@@ -11,7 +11,7 @@ class TestCategory < Minitest::Test
   # 4. test read only and full access scopes by loading scopes.yaml
 
   def setup
-    @scopes_from_yaml = YAML.load_file(File.dirname(__FILE__) + '/../../../lib/sendgrid/helpers/permissions/scopes.yml').freeze
+    @scopes_from_yaml = YAML.load_file("#{File.dirname(__FILE__)}/../../../lib/sendgrid/helpers/permissions/scopes.yml").freeze
   end
 
   def test_admin_scopes
diff --git a/test/sendgrid/test_sendgrid-ruby.rb b/test/sendgrid/test_sendgrid-ruby.rb
index 248beb07..814e1f86 100644
--- a/test/sendgrid/test_sendgrid-ruby.rb
+++ b/test/sendgrid/test_sendgrid-ruby.rb
@@ -1,6 +1,6 @@
 require 'simplecov'
 SimpleCov.start
-require_relative '../../lib/sendgrid-ruby.rb'
+require_relative '../../lib/sendgrid-ruby'
 require 'ruby_http_client'
 require 'minitest/autorun'
 require 'minitest/unit'