diff --git a/.travis.yml b/.travis.yml
index 17a61fa..f870d87 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,10 @@
 language: ruby
 rvm:
-  - 2.0.0
-  - 1.9.3
+  - 2.3.8
+  - 2.4.6
+  - 2.5.5
+  - 2.6.3
+  - ruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head
diff --git a/lib/sidekiq/priority/server/fetch.rb b/lib/sidekiq/priority/server/fetch.rb
index d4f6476..17282a8 100644
--- a/lib/sidekiq/priority/server/fetch.rb
+++ b/lib/sidekiq/priority/server/fetch.rb
@@ -1,4 +1,3 @@
-require 'celluloid'
 require 'sidekiq/fetch'
 
 module Sidekiq