diff --git a/sendgrid-ruby.gemspec b/sendgrid-ruby.gemspec
index 3856eb3b..de27fb90 100644
--- a/sendgrid-ruby.gemspec
+++ b/sendgrid-ruby.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = '>= 2.2'
 
   spec.license = 'MIT'
-  spec.files         = `git ls-files -z`.split("\x0")
+  spec.files         = `git ls-files -z`.split("\x0").grep_v(%r{^(gemfiles|spec|test)/})
   spec.executables   = spec.files.grep(/^bin/) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(/^(test|spec|features)/)
   spec.require_paths = ['lib']