diff --git a/doc/source/_vendor/container-subs-stx.txt b/doc/source/_vendor/container-subs-stx.txt
new file mode 100644
index 000000000..62a6b4a0f
--- /dev/null
+++ b/doc/source/_vendor/container-subs-stx.txt
@@ -0,0 +1,59 @@
+
+.. |v_airshipit-armada| replace:: 8a1638098f88d92bf799ef4934abe569789b885e-ubuntu_bionic
+.. |v_calico-cni| replace:: v3.12.0
+.. |v_calico-kube-controllers| replace:: v3.12.0
+.. |v_calico-node| replace:: v3.12.0
+.. |v_calico-pod2daemon-flexvol| replace:: v3.12.0
+.. |v_coredns| replace:: 1.6.7
+.. |v_defaultbackend| replace:: 1.4
+.. |v_etcd| replace:: 3.4.3-0
+.. |v_external_storage-cephfs-provisioner| replace:: v2.1.0-k8s1.11
+.. |v_external_storage-rbd-provisioner| replace:: v2.1.1-k8s1.11
+.. |v_google_containers-kubernetes-dashboard-init-amd64| replace:: v1.0.0
+.. |v_hashicorp-vault-k8s| replace:: 0.4.0
+.. |v_ingress-nginx-controller| replace:: v0.41.2
+.. |v_jetstack-cert-manager-acmesolver| replace:: v0.15.0
+.. |v_jetstack-cert-manager-cainjector| replace:: v0.15.0
+.. |v_jetstack-cert-manager-controller| replace:: v0.15.0
+.. |v_jetstack-cert-manager-webhook| replace:: v0.15.0
+.. |v_jettech-kube-webhook-certgen| replace:: v1.5.0
+.. |v_k8scsi-csi-attacher| replace:: v2.2.0
+.. |v_k8scsi-csi-node-driver-registrar| replace:: v1.3.0
+.. |v_k8scsi-csi-provisioner| replace:: v1.6.0
+.. |v_k8scsi-csi-resizer| replace:: v0.5.0
+.. |v_k8scsi-csi-snapshotter| replace:: v2.1.0
+.. |v_k8scsi-snapshot-controller| replace:: v2.0.0-rc2
+.. |v_kube-apiserver| replace:: v1.18.1
+.. |v_kube-controller-manager| replace:: v1.18.1
+.. |v_kube-proxy| replace:: v1.18.1
+.. |v_kube-scheduler| replace:: v1.18.1
+.. |v_kubebuilder-kube-rbac-proxy| replace:: v0.4.0
+.. |v_kubernetes-helm-tiller| replace:: v2.16.1
+.. |v_metrics-server-metrics-server| replace:: v0.4.1
+.. |v_netapp-trident| replace:: 20.04.0
+.. |v_nfd-node-feature-discovery| replace:: v0.8.1
+.. |v_nfvpe-multus| replace:: v3.4
+.. |v_pause| replace:: 3.2
+.. |v_rabbitmq| replace:: 3.8.11-management
+.. |v_stackanetes-kubernetes-entrypoint| replace:: v0.3.1
+.. |v_starlingx-ceph-config-helper| replace:: v1.15.0
+.. |v_starlingx-dex| replace:: stx.4.0-v2.14.0-1
+.. |v_starlingx-intel-fpga-plugin| replace:: stx.3.0-v0.11.0-103-g4f28657
+.. |v_starlingx-k8s-cni-sriov| replace:: stx.5.0-v2.6-7-gb18123d8
+.. |v_starlingx-k8s-plugins-sriov-network-device| replace:: stx.4.0-v3.2-16-g4e0302ae
+.. |v_starlingx-locationservice-base| replace:: stx.5.0-v1.0.1
+.. |v_starlingx-n3000-opae| replace:: stx.4.0-v1.0.0
+.. |v_starlingx-notificationclient-base| replace:: stx.5.0-v1.0.4
+.. |v_starlingx-notificationservice-base| replace:: stx.5.0-v1.0.4
+.. |v_starlingx-portieris| replace:: stx.5.0-v0.7.0
+.. |v_starlingx-rvmc| replace:: stx.5.0-v1.0.0
+.. |v_starlingx-stx-fm-subagent| replace:: stx.5.0-v1.0.0
+.. |v_starlingx-stx-fm-trap-subagent| replace:: stx.5.0-v1.0.1
+.. |v_starlingx-stx-oidc-client| replace:: stx.5.0-v1.0.3
+.. |v_starlingx-stx-platformclients| replace:: stx.5.0-v1.4.3
+.. |v_starlingx-stx-snmp| replace:: stx.5.0-v1.0.0
+.. |v_starlingx-stx-vault-manager| replace:: stx.5.0-v1.18.3
+.. |v_untergeek-curator| replace:: 5.7.6
+.. |v_vault| replace:: 1.4.2
+.. |v_wind-river-cloud-platform-deployment-manager| replace:: WRCP_21.05
+.. |v_wind-river-cmk| replace:: WRCP.20.01-v1.3.1-15-ge3df769-1
diff --git a/doc/source/_vendor/vendor_strings.txt b/doc/source/_vendor/vendor_strings.txt
index fafc95f06..d3e188e27 100755
--- a/doc/source/_vendor/vendor_strings.txt
+++ b/doc/source/_vendor/vendor_strings.txt
@@ -90,4 +90,10 @@
 
 .. |registry-url| replace:: https://hub.docker.com/layers
 
-.. |_link-inst-book| replace:: :ref:`Installation guide <index-install-e083ca818006>`
\ No newline at end of file
+.. |_link-inst-book| replace:: :ref:`Installation guide <index-install-e083ca818006>`
+
+
+
+.. Placeholders for container versions
+
+.. include:: /_vendor/container-subs-stx.txt
diff --git a/doc/upper-constraints.txt b/doc/upper-constraints.txt
index e42ce1f88..44f847074 100644
--- a/doc/upper-constraints.txt
+++ b/doc/upper-constraints.txt
@@ -1,4 +1,4 @@
-sphinx==4.2.0
+sphinx==5.0.0
 # ntlm-auth===1.5.0
 # voluptuous===0.12.1
 # chardet===4.0.0