diff --git a/.gitignore b/.gitignore
index 84d48d86e..b3bcd969e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 _gh_pages
 _site
 .ruby-version
+Gemfile.lock
 
 # Numerous always-ignore extensions
 *.diff
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 000000000..eb9646efe
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,6 @@
+source 'https://rubygems.org'
+
+group :development do
+  gem 'jekyll', '~> 2.5.2'
+  gem 'rouge', '~> 1.7.4'
+end