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-rw-r--r--yahns.gemspec3
1 files changed, 3 insertions, 0 deletions
diff --git a/yahns.gemspec b/yahns.gemspec
index 59c0b9b..0efe287 100644
--- a/yahns.gemspec
+++ b/yahns.gemspec
@@ -22,6 +22,9 @@ Gem::Specification.new do |s|
   # Matz Ruby release.
   s.add_development_dependency(%q<minitest>, '>= 4.3', '< 6.0')
 
+  # for Rack::Utils::HeaderHash#each
+  s.add_development_dependency(%q<rack>, '>= 1.1')
+
   s.homepage = "http://yahns.yhbt.net/README"
   s.licenses = "GPL-3.0+"
 end