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-rw-r--r--lib/rdoc/discover.rb2
-rw-r--r--olddoc.gemspec5
2 files changed, 5 insertions, 2 deletions
diff --git a/lib/rdoc/discover.rb b/lib/rdoc/discover.rb
index 9450f42..30c5ae2 100644
--- a/lib/rdoc/discover.rb
+++ b/lib/rdoc/discover.rb
@@ -1,6 +1,6 @@
 # :stopdoc:
 begin
-  gem 'rdoc', '~> 4.1'
+  gem 'rdoc', [ '>= 4.2', '< 6.0' ]
   require_relative '../olddoc'
 rescue Gem::LoadError
 end unless defined?(Olddoc)
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