diff --git a/chroot_version_hooks.d/179_purge_ruby b/chroot_version_hooks.d/179_purge_ruby
new file mode 100644
index 0000000..61be2bb
--- /dev/null
+++ b/chroot_version_hooks.d/179_purge_ruby
@@ -0,0 +1,10 @@
+# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# These packages have been removed, so make sure they're cleaned up.
+sudo qmerge -Uqy \
+  app-admin/puppet \
+  app-eselect/eselect-ruby \
+  dev-lang/ruby \
+  $(qlist -IC virtual/ruby dev-ruby/)