diff --git a/.gitignore b/.gitignore
index 0cb6eeb..e892f6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,9 @@
 /.bundle/
 /.yardoc
-/Gemfile.lock
 /_yardoc/
 /coverage/
 /doc/
 /pkg/
 /spec/reports/
-/tmp/
+/tmp/*
+!/tmp/.keep