diff --git a/http_router.gemspec b/http_router.gemspec
index 0dc6d00..a34b557 100644
--- a/http_router.gemspec
+++ b/http_router.gemspec
@@ -2,7 +2,13 @@
 
 require File.join(File.dirname(__FILE__), 'lib', 'http_router', 'version')
 
+GEM_CERT = File.expand_path('../gem-public_cert.pem', __dir__).freeze
+GEM_KEY  = File.expand_path('../gem-private_key.pem', __dir__).freeze
+
 Gem::Specification.new do |s|
+  s.cert_chain  = [GEM_CERT] if File.file? GEM_CERT
+  s.signing_key = GEM_KEY    if File.file? GEM_KEY
+
   s.name = 'http_router'
   s.version = HttpRouter::VERSION
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=