diff --git a/.travis.yml b/.travis.yml
index a9047ce..c725ab0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: ruby
 
 rvm:
-  - 1.9.3
   - 2.0.0
   - 2.1
   - 2.2
diff --git a/rack-dev-mark.gemspec b/rack-dev-mark.gemspec
index 68ecb74..d47d785 100644
--- a/rack-dev-mark.gemspec
+++ b/rack-dev-mark.gemspec
@@ -16,6 +16,8 @@ Gem::Specification.new do |gem|
   gem.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   gem.require_paths = ['lib']
 
+  gem.required_ruby_version = '>= 2.0.0'
+
   gem.add_dependency "rack", ">= 1.1"
 
   gem.add_development_dependency "rake"