2 files changed, 1 insertions, 0 deletions

diff --git a/Rakefile b/Rakefile
index 4448d2e..093db66 100644
--- a/Rakefile
+++ b/Rakefile
@@ -132,6 +132,7 @@ if defined?(Gem) and defined?(Gem::PackageTask)
     s.email = "flori@ping.de"
     s.homepage = "http://flori.github.com/#{PKG_NAME}"
     s.license = 'Ruby'
+    s.required_ruby_version = '~> 2.0'
   end
 
   desc 'Creates a json.gemspec file'
diff --git a/json.gemspec b/json.gemspec
index 54bae4d..3a22e8b 100644
--- a/json.gemspec
+++ b/json.gemspec