diff --git a/_config.yml b/_config.yml
index 5cd1dba..c35c27d 100644
--- a/_config.yml
+++ b/_config.yml
@@ -5,6 +5,6 @@ description: I'm a mail server.
 
 # Build settings
 markdown: kramdown
-exclude: ["README.md"]
+exclude: ["README.md", "Gemfile", "Gemfile.lock"]
 sass:
   style: compressed