diff --git a/_config.yml b/_config.yml
index 5bd12fb..1a33eef 100644
--- a/_config.yml
+++ b/_config.yml
@@ -2,4 +2,4 @@ title: Time Machine theme
 description: Time Machine is a theme for GitHub Pages.
 show_downloads: true
 google_analytics:
-theme: 
+theme: jekyll-theme-time-machine
\ No newline at end of file
diff --git a/_layouts/default.html b/_layouts/default.html
index fa717c1..8b389ac 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -10,7 +10,7 @@
   <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
   <script type="text/javascript" src="{{ '/assets/js/script.js' | relative_url }}"></script>
 
-  <title>{{ site.title | default: site.github.repository_name }}</title>
+{% seo %}
   <meta name="description" content="{{ site.description | default: site.github.project_tagline }}">
 
   <meta name="viewport" content="width=device-width,initial-scale=1">
diff --git a/jekyll-theme-time-machine.gemspec b/jekyll-theme-time-machine.gemspec
index 7dc52f0..0a9f854 100644
--- a/jekyll-theme-time-machine.gemspec
+++ b/jekyll-theme-time-machine.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