diff --git a/Rakefile b/Rakefile
index 842ae70..609fb96 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,10 +1,2 @@
 require 'bundler/setup'
-require 'tachikoma'
 require 'tachikoma/tasks'
-
-Tachikoma.root_path = File.expand_path(__FILE__) # reset `root_path`
-
-# configure example
-namespace :tachikoma do
-  @default_timestamp_format = '%Y-%m-%d-%H-%M-%S%z'
-end