diff --git a/.rubocop.yml b/.rubocop.yml
index 4a3220d9..2ce3b34d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,11 +4,16 @@ AllCops:
   TargetRubyVersion: 1.9
   Exclude:
     - 'test/dummy/**/*'
+    - 'vendor/**/*'
 
 Metrics/BlockLength:
   Exclude:
     - 'wicked_pdf.gemspec'
 
+Metrics/ClassLength:
+  Exclude:
+    - 'lib/wicked_pdf.rb'
+
 # I'd like wicked_pdf to keep Ruby 1.8 compatibility for now
 Style/HashSyntax:
   EnforcedStyle: hash_rockets