diff --git a/rakelib/version.rake b/rakelib/version.rake
new file mode 100644
index 0000000..afcd01c
--- /dev/null
+++ b/rakelib/version.rake
@@ -0,0 +1,48 @@
+class << (helper = Bundler::GemHelper.instance)
+  SOURCE_PATH = "lib/pp.rb"
+  VERSION_PATTERN = /^\s*VERSION\s*=\s*(["'])\K.*?(?=\1)/
+
+  def update_source_version(path = SOURCE_PATH, pattern = VERSION_PATTERN)
+    File.open(path, "r+b") do |f|
+      d = f.read
+      if d.sub!(pattern) {version.to_s}
+        f.rewind
+        f.truncate(0)
+        f.print(d)
+      end
+    end
+  end
+
+  def commit_bump
+    sh(%W[git commit -m bump\ up\ to\ #{gemspec.version}
+          #{SOURCE_PATH}])
+  end
+
+  def version=(v)
+    gemspec.version = v
+    update_source_version
+    commit_bump
+  end
+end
+
+major, minor, teeny = helper.gemspec.version.segments
+
+namespace :dev do
+  task "bump:teeny" do
+    helper.version = Gem::Version.new("#{major}.#{minor}.#{teeny+1}")
+  end
+
+  task "bump:minor" do
+    helper.version = Gem::Version.new("#{major}.#{minor+1}.0")
+  end
+
+  task "bump:major" do
+    helper.version = Gem::Version.new("#{major+1}.0.0")
+  end
+
+  task "bump" => "bump:teeny"
+
+  task "tag" do
+    helper.__send__(:tag_version)
+  end
+end