diff --git a/rubygems-mirror.gemspec b/rubygems-mirror.gemspec
index d07aaa5..4327ee1 100644
--- a/rubygems-mirror.gemspec
+++ b/rubygems-mirror.gemspec
@@ -16,9 +16,9 @@ Gem::Specification.new do |s|
   s.rdoc_options = ["--main".freeze, "README.rdoc".freeze]
   s.extra_rdoc_files = ["CHANGELOG.rdoc".freeze, "Manifest.txt".freeze, "README.rdoc".freeze, "CHANGELOG.rdoc".freeze, "README.rdoc".freeze]
   s.require_paths = ["lib".freeze]
-  s.rubygems_version = "2.7.6".freeze
+  s.required_ruby_version = ">= 2.4"
   s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version=
   s.specification_version = 4
 
-  s.add_runtime_dependency(%q<net-http-persistent>.freeze, ["~> 2.9"])
+  s.add_runtime_dependency(%q<net-http-persistent>.freeze, ["~> 4.0"])
 end