diff --git a/core/lib/mikutwitter/utils.rb b/core/lib/mikutwitter/utils.rb
index 4d53103..febd7eb 100644
--- a/core/lib/mikutwitter/utils.rb
+++ b/core/lib/mikutwitter/utils.rb
@@ -12,7 +12,7 @@ module MikuTwitter::Utils
 
   def initialize(*a, &b)
     @twitter_host = 'api.twitter.com'
-    @base_path = "http://#{@twitter_host}/1.1".freeze
+    @base_path = "https://#{@twitter_host}/1.1".freeze
     super(*a, &b)
   end