diff --git a/guides/source/initialization.md b/guides/source/initialization.md
index 0cfabe2a66..1541ea38cd 100644
--- a/guides/source/initialization.md
+++ b/guides/source/initialization.md
@@ -116,8 +116,6 @@ A standard Rails application depends on several gems, specifically:
 * mail
 * mime-types
 * rack
-* rack-cache
-* rack-mount
 * rack-test
 * rails
 * railties