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-rw-r--r--unicorn.gemspec2
1 files changed, 2 insertions, 0 deletions
diff --git a/unicorn.gemspec b/unicorn.gemspec
index d336c90..bd3511f 100644
--- a/unicorn.gemspec
+++ b/unicorn.gemspec
@@ -49,5 +49,7 @@ Gem::Specification.new do |s|
   # *strongly* recommended for security reasons.
   s.add_dependency(%q<rack>)
 
+  s.add_development_dependency('isolate', '~> 2.0.2')
+
   # s.licenses = %w(GPLv2 Ruby) # licenses= method is not in older RubyGems
 end