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-rw-r--r--zbatery.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/zbatery.gemspec b/zbatery.gemspec
index d981751..4857e4e 100644
--- a/zbatery.gemspec
+++ b/zbatery.gemspec
@@ -53,6 +53,7 @@ Gem::Specification.new do |s|
   # rainbows 0.90.2 depends on unicorn 0.96.1,
   # unicorn 0.96.0 and before had a memory leak
   # that was only triggered in Rainbows!/Zbatery
+  s.add_dependency(%q<unicorn>, ["~> 0.97.0"])
   s.add_dependency(%q<rainbows>, [">= 0.90.2", "<= 1.0.0"])
 
   # s.licenses = %w(GPLv2 Ruby) # accessor not compatible with older RubyGems