diff --git a/lib/travis/api/attack.rb b/lib/travis/api/attack.rb
index dfb9d7e0..96af80bf 100644
--- a/lib/travis/api/attack.rb
+++ b/lib/travis/api/attack.rb
@@ -1,5 +1,5 @@
 require 'rack/attack'
-require 'cidr'
+require 'netaddr'
 
 class Rack::Attack
   class Request