asciidoctor-fb2.gemspec in asciidoctor-fb2-0.5.1 vs asciidoctor-fb2.gemspec in asciidoctor-fb2-0.6.0

@@ -17,15 +17,15 @@
     File.basename(f)
   end
   s.require_paths = ['lib']
 
   s.add_runtime_dependency 'asciidoctor', '~> 2.0'
-  s.add_runtime_dependency 'fb2rb', '~> 0.6.0'
+  s.add_runtime_dependency 'fb2rb', '>= 0.6', '< 0.8'
   s.add_runtime_dependency 'mime-types', '~> 3.0'
 
   s.add_development_dependency 'asciidoctor-diagram', '~> 2.0'
   s.add_development_dependency 'rake', '~> 13.0'
-  s.add_development_dependency 'rspec', '~> 3.10.0'
+  s.add_development_dependency 'rspec', '~> 3.12.0'
   s.add_development_dependency 'rubocop', '~> 1.12.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.5.0'
   s.add_development_dependency 'rubocop-rspec', '~> 2.2.0'
 end