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-rw-r--r--rainbows.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/rainbows.gemspec b/rainbows.gemspec
index 57447a7..3327d05 100644
--- a/rainbows.gemspec
+++ b/rainbows.gemspec
@@ -44,6 +44,7 @@ Gem::Specification.new do |s|
   # The HTTP parser in Unicorn <= 0.97.0 was vulnerable to a remote DoS
   # when exposed directly to untrusted clients.
   s.add_dependency(%q<unicorn>, [">= 0.97.1", "< 2.0.0"])
+  s.add_development_dependency(%q<isolate>, "~> 2.0.2")
 
   # Unicorn already depends on Rack
   # s.add_dependency(%q<rack>)