diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..74d973a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+yardoc
+coverage
+pkg
+Gemfile.lock
+
+lib/oga/lexer.rb
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index dd2451a..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,44 +0,0 @@
-PATH
-  remote: .
-  specs:
-    oga (0.0.1)
-      ast
-      racc
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    ast (1.1.0)
-    cliver (0.3.2)
-    diff-lcs (1.2.5)
-    docile (1.1.3)
-    kramdown (1.3.2)
-    multi_json (1.8.4)
-    racc (1.4.11)
-    rake (10.1.1)
-    rspec (2.14.1)
-      rspec-core (~> 2.14.0)
-      rspec-expectations (~> 2.14.0)
-      rspec-mocks (~> 2.14.0)
-    rspec-core (2.14.7)
-    rspec-expectations (2.14.5)
-      diff-lcs (>= 1.1.3, < 2.0)
-    rspec-mocks (2.14.6)
-    simplecov (0.8.2)
-      docile (~> 1.1.0)
-      multi_json
-      simplecov-html (~> 0.8.0)
-    simplecov-html (0.8.0)
-    yard (0.8.7.3)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  cliver
-  kramdown
-  oga!
-  rake
-  rspec
-  simplecov
-  yard