diff --git a/src/whitelist/sites.conf b/src/whitelist/sites.conf
index 1b61d38..970b5f3 100644
--- a/src/whitelist/sites.conf
+++ b/src/whitelist/sites.conf
@@ -43,6 +43,7 @@ www.python.org
 get.rvm.io
 rvm.io
 rubygems.org
+cache.ruby-lang.org
 # Rust
 crates.io
 sh.rustup.rs