diff --git a/open_id_authentication2.gemspec b/open_id_authentication2.gemspec
index f06e826..cf6f6be 100644
--- a/open_id_authentication2.gemspec
+++ b/open_id_authentication2.gemspec
@@ -21,13 +21,26 @@ Gem::Specification.new do |spec|
     # Splats (alphabetical)
     "lib/**/*.rb",
     # Files (alphabetical)
+    "CHANGELOG.md",
+    "CODE_OF_CONDUCT.md",
+    "CONTRIBUTING.md",
     "LICENSE.txt",
     "README.md",
+    "SECURITY.md"
   ]
-
-  spec.license = "MIT"
+  spec.executables = spec.files.grep(%r{^bin/}).map { |f| File.basename(f) }
+  spec.licenses = ["MIT"]
+  spec.require_paths = ["lib"]
   spec.required_ruby_version = ">= 2.7.0"
 
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "#{spec.homepage}/tree/v#{spec.version}"
+  spec.metadata["changelog_uri"] = "#{spec.homepage}/blob/v#{spec.version}/CHANGELOG.md"
+  spec.metadata["bug_tracker_uri"] = "#{spec.homepage}/issues"
+  spec.metadata["documentation_uri"] = "https://www.rubydoc.info/gems/#{spec.name}/#{spec.version}"
+  spec.metadata["wiki_uri"] = "#{spec.homepage}/wiki"
+  spec.metadata["rubygems_mfa_required"] = "true"
+
   spec.add_dependency("rack-openid2", "~> 2.0", ">= 2.0.1")
   spec.add_dependency("version_gem", "~> 1.1", ">= 1.1.4")