diff --git a/elements/rocky-container-stackhpc/containerfiles/9-stackhpc b/elements/rocky-container-stackhpc/containerfiles/9-stackhpc
index d7666c9..1177807 100644
--- a/elements/rocky-container-stackhpc/containerfiles/9-stackhpc
+++ b/elements/rocky-container-stackhpc/containerfiles/9-stackhpc
@@ -1,6 +1,6 @@
 # Based on https://github.com/openstack/diskimage-builder/blob/master/diskimage_builder/elements/rocky-container/containerfiles/9
-
-FROM docker.io/rockylinux/rockylinux:9
+ARG ROCKY_MINOR_DOT_VERSION=.6
+FROM quay.io/rockylinux/rockylinux:9${ROCKY_MINOR_DOT_VERSION}
 ARG ROCKY_USE_CUSTOM_DNF_MIRRORS="false"
 # Comma-delimited list of repo URLs
 ARG ROCKY_CUSTOM_DNF_MIRROR_URLS