diff --git a/td-idf-similarity.gemspec b/td-idf-similarity.gemspec
index bf26335..1379fd0 100644
--- a/td-idf-similarity.gemspec
+++ b/td-idf-similarity.gemspec
@@ -20,6 +20,6 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency('coveralls')
   s.add_development_dependency('json', '< 2')
-  s.add_development_dependency('rake', '< 12')
-  s.add_development_dependency('rspec', '~> 2.10')
+  s.add_development_dependency('rake')
+  s.add_development_dependency('rspec', '~> 3.0')
 end