diff --git a/fog.gemspec b/fog.gemspec
index eebed4949..e28e25a53 100644
--- a/fog.gemspec
+++ b/fog.gemspec
@@ -44,6 +44,9 @@ Gem::Specification.new do |s|
   s.rdoc_options = ["--charset=UTF-8"]
   s.extra_rdoc_files = %w[README.md]
 
+  ## Ruby version
+  s.required_ruby_version = ">= 2.0.0"
+
   s.add_dependency("fog-core", "~> 1.32")
   s.add_dependency("fog-json")
   s.add_dependency("fog-xml", "~> 0.1.1")