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-rw-r--r--sleepy_penguin.gemspec2
1 files changed, 1 insertions, 1 deletions
diff --git a/sleepy_penguin.gemspec b/sleepy_penguin.gemspec
index 9032fdd..46a0036 100644
--- a/sleepy_penguin.gemspec
+++ b/sleepy_penguin.gemspec
@@ -19,6 +19,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency('test-unit', '~> 3.0')
   s.add_development_dependency('olddoc', '~> 1.0')
   s.add_development_dependency('strace_me', '~> 1.0')
-
+  s.required_ruby_version = '>= 2.0'
   s.licenses = %w(LGPL-2.1+)
 end