diff --git a/_plugins/youtube.rb b/_plugins/youtube.rb
index c1f72d9..35007d2 100644
--- a/_plugins/youtube.rb
+++ b/_plugins/youtube.rb
@@ -20,7 +20,7 @@ def initialize(tagName, markup, tokens)
   end
 
   def render(context)
-    "<iframe width=\"#{@width}\" height=\"#{@height}\" src=\"http://www.youtube.com/embed/#{@id}?color=white&theme=light\"></iframe>"
+    "<iframe width=\"#{@width}\" height=\"#{@height}\" src=\"https://www.youtube.com/embed/#{@id}?color=white&theme=light\"></iframe>"
   end
 
   Liquid::Template.register_tag "youtube", self