diff --git a/.gitignore b/.gitignore
index 6a502e9..b7d2894 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,6 @@
 # Ignore all logfiles and tempfiles.
 /log/*.log
 /tmp
+
+# built .gem file by `rake build`
+/pkg
diff --git a/Rakefile b/Rakefile
index ba6b733..f3651a1 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,3 +4,5 @@
 require File.expand_path('../config/application', __FILE__)
 
 Rails.application.load_tasks
+
+require "bundler/gem_tasks"