diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 1276e71..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,19 +0,0 @@
-PATH
-  remote: .
-  specs:
-    timecost (0.2.1)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    minitest (4.7.5)
-    rake (10.1.0)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  bundler (~> 1.6)
-  minitest (~> 4.7.5)
-  rake (~> 10.0)
-  timecost!