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-rw-r--r--olddoc.gemspec5
1 files changed, 4 insertions, 1 deletions
diff --git a/olddoc.gemspec b/olddoc.gemspec
index d059955..a09ffe0 100644
--- a/olddoc.gemspec
+++ b/olddoc.gemspec
@@ -15,8 +15,11 @@ Gem::Specification.new do |s|
   s.description = readme_description
   s.email = 'e@80x24.org'
   s.files = manifest
-  s.add_dependency('rdoc', '~> 4.2')
+
+  # works fine with RDoc 5.x
+  s.add_dependency('rdoc', ['>= 4.2', '< 6.0'])
   s.add_dependency('builder', '~> 3.2')
+  s.required_ruby_version = '>= 1.9.3'
   s.homepage = Olddoc.config['rdoc_url']
   s.licenses = 'GPL-3.0+'
 end