diff --git a/getting_started/setup_vm/roles/ccf_build/vars/clang15.yml b/getting_started/setup_vm/roles/ccf_build/vars/clang15.yml
index 8ea7eb138e82..c8e273794ef9 100644
--- a/getting_started/setup_vm/roles/ccf_build/vars/clang15.yml
+++ b/getting_started/setup_vm/roles/ccf_build/vars/clang15.yml
@@ -26,7 +26,7 @@ debs:
   - shellcheck # bash lint
   - iptables # partition test infra
   - unzip # required to unzip protoc install
-  - ruby # required to install cddl checker
+  - rubygems # required to install cddl checker
 
 # Not installed on GitHub Actions environment because of conflicting package
 docker_debs: