diff --git a/.github/workflows/cibuild-setup-ubuntu.sh b/.github/workflows/cibuild-setup-ubuntu.sh
index 8c56ea2ac..17341b2b2 100755
--- a/.github/workflows/cibuild-setup-ubuntu.sh
+++ b/.github/workflows/cibuild-setup-ubuntu.sh
@@ -16,6 +16,7 @@ PACKAGES=(
 	mdadm
 	ntp
 	socat
+	ruby-asciidoctor
 )
 
 PACKAGES_OPTIONAL=(