diff --git a/_config.yml b/_config.yml
index 7baaa17..c5cf3fd 100644
--- a/_config.yml
+++ b/_config.yml
@@ -2,4 +2,4 @@ title: Hacker theme
 description: Hacker is a theme for GitHub Pages.
 show_downloads: true
 google_analytics:
-theme: 
+theme: jekyll-theme-hacker
\ No newline at end of file
diff --git a/_layouts/default.html b/_layouts/default.html
index 51cf971..f8ccdd2 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -5,7 +5,8 @@
     <meta http-equiv="X-UA-Compatible" content="chrome=1">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
-    <title>{{ site.title | default: site.github.repository_name }} by {{ site.github.owner_name }}</title>
+
+{% seo %}
   </head>
 
   <body>
diff --git a/jekyll-theme-hacker.gemspec b/jekyll-theme-hacker.gemspec
index 4f7b4aa..ab59626 100644
--- a/jekyll-theme-hacker.gemspec
+++ b/jekyll-theme-hacker.gemspec
@@ -14,5 +14,6 @@ Gem::Specification.new do |s|
   end
 
   s.platform      = Gem::Platform::RUBY
-  s.add_runtime_dependency "jekyll", "~> 3.3"
+  s.add_runtime_dependency "jekyll", "~> 3.5"
+  s.add_runtime_dependency "jekyll-seo-tag", "~> 2.0"
 end
