diff --git a/searchkick.gemspec b/searchkick.gemspec
index c007d0a..33a35cf 100644
--- a/searchkick.gemspec
+++ b/searchkick.gemspec
@@ -18,6 +18,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features|benchmark)/})
   spec.require_paths = ["lib"]
 
+  spec.required_ruby_version = ">= 2.2.0"
+
   spec.add_dependency "activemodel", ">= 4.2"
   spec.add_dependency "elasticsearch", ">= 5"
   spec.add_dependency "hashie"
--
libgit2 0.21.0