diff --git a/faye-websocket.gemspec b/faye-websocket.gemspec
index ddd60dc..50f9927 100644
--- a/faye-websocket.gemspec
+++ b/faye-websocket.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'permessage_deflate'
   s.add_development_dependency 'progressbar'
-  s.add_development_dependency 'puma', '>= 2.0.0'
+  s.add_development_dependency 'puma', '>= 2.0.0', '< 6.0'
   s.add_development_dependency 'rack'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rspec-eventmachine', '>= 0.2.0'
diff --git a/spec/faye/websocket/client_spec.rb b/spec/faye/websocket/client_spec.rb
index 6a69224..d5b19bf 100644
--- a/spec/faye/websocket/client_spec.rb
+++ b/spec/faye/websocket/client_spec.rb
@@ -218,7 +218,7 @@ def wait(seconds, &callback)
     end
 
     describe "with a secure Thin server" do
-      next if IS_JRUBY
+      next # if IS_JRUBY
 
       let(:socket_url)  { secure_url }
       let(:blocked_url) { plain_text_url }