diff --git a/hanami-router.gemspec b/hanami-router.gemspec
index a264db5..9b7ea9e 100644
--- a/hanami-router.gemspec
+++ b/hanami-router.gemspec
@@ -4,7 +4,13 @@ lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "hanami/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 |spec|
+  spec.cert_chain  = [GEM_CERT] if File.file? GEM_CERT
+  spec.signing_key = GEM_KEY    if File.file? GEM_KEY
+
   spec.name          = "hanami-router"
   spec.version       = Hanami::Router::VERSION
   spec.authors       = ["Luca Guidi"]