diff --git a/.travis.yml b/.travis.yml
index ed5c379e..5ead5542 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ language: ruby
 rvm:
   - 2.2
   - rbx-2
-  - jruby
+  - jruby-9.0.0.0.pre1
   - jruby-head
   - ruby-head
 
diff --git a/sinatra.gemspec b/sinatra.gemspec
index e1ff9169..0f42cd98 100644
--- a/sinatra.gemspec
+++ b/sinatra.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new 'sinatra', Sinatra::VERSION do |s|
   s.extra_rdoc_files  = s.files.select { |p| p =~ /^README/ } << 'LICENSE'
   s.rdoc_options      = %w[--line-numbers --inline-source --title Sinatra --main README.rdoc --encoding=UTF-8]
 
-  s.add_dependency 'rack', '~> 1.6'
+  s.add_dependency 'rack', '>= 1.6'
   s.add_dependency 'tilt', '~> 2.0'
   s.add_dependency 'rack-protection', '~> 1.5'
 end