diff --git a/README.md b/README.md
index b8ccb73..cfc4434 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,8 @@ The following URLs need to be accessible (prefix with `https://`):
     * hub.docker.com
     * registry-1.docker.io
     * production.cloudflare.docker.com
+  * GitHub Container Registry - (for use of DNPM:DIP)
+    * ghcr.io
 * To report bridgeheads operational status
   * healthchecks.verbis.dkfz.de
 * only for DKTK/CCP
@@ -95,7 +97,7 @@ The following URLs need to be accessible (prefix with `https://`):
 * only for German Biobank Node
   * broker.bbmri.de
 
-> 📝 This URL list is subject to change. Instead of the individual names, we highly recommend whitelisting wildcard domains: *.dkfz.de, github.com, *.docker.com, *.docker.io, *.samply.de, *.bbmri.de.
+> 📝 This URL list is subject to change. Instead of the individual names, we highly recommend whitelisting wildcard domains: *.dkfz.de, github.com, *.docker.com, *.docker.io, *.ghcr.io, *.samply.de, *.bbmri.de.
 
 > 📝 Ubuntu's pre-installed uncomplicated firewall (ufw) is known to conflict with Docker, more info [here](https://github.com/chaifeng/ufw-docker).
 
diff --git a/ccp/modules/dnpm-node-compose.yml b/ccp/modules/dnpm-node-compose.yml
index 62e04b7..10f6f1b 100644
--- a/ccp/modules/dnpm-node-compose.yml
+++ b/ccp/modules/dnpm-node-compose.yml
@@ -43,7 +43,7 @@ services:
       - "traefik.http.routers.dnpm-auth.tls=true"
 
   dnpm-portal:
-    image: ghcr.io/dnpm-dip/portal:{DNPM_IMAGE_TAG:-latest}
+    image: ghcr.io/dnpm-dip/portal:${DNPM_IMAGE_TAG:-latest}
     container_name: bridgehead-dnpm-portal
     environment:
       - NUXT_API_URL=http://dnpm-backend:9000/
@@ -58,7 +58,7 @@ services:
 
   dnpm-backend:
     container_name: bridgehead-dnpm-backend
-    image: ghcr.io/dnpm-dip/backend:{DNPM_IMAGE_TAG:-latest}
+    image: ghcr.io/dnpm-dip/backend:${DNPM_IMAGE_TAG:-latest}
     environment:
       - LOCAL_SITE=${ZPM_SITE}:${SITE_NAME}   # Format: {Site-ID}:{Site-name}, e.g. UKT:Tübingen
       - RD_RANDOM_DATA=${DNPM_SYNTH_NUM:--1}
diff --git a/minimal/modules/dnpm-node-compose.yml b/minimal/modules/dnpm-node-compose.yml
index 6c220e7..cb7e524 100644
--- a/minimal/modules/dnpm-node-compose.yml
+++ b/minimal/modules/dnpm-node-compose.yml
@@ -43,7 +43,7 @@ services:
       - "traefik.http.routers.dnpm-auth.tls=true"
 
   dnpm-portal:
-    image: ghcr.io/dnpm-dip/portal:{DNPM_IMAGE_TAG:-latest}
+    image: ghcr.io/dnpm-dip/portal:${DNPM_IMAGE_TAG:-latest}
     container_name: bridgehead-dnpm-portal
     environment:
       - NUXT_API_URL=http://dnpm-backend:9000/
@@ -58,7 +58,7 @@ services:
 
   dnpm-backend:
     container_name: bridgehead-dnpm-backend
-    image: ghcr.io/dnpm-dip/backend:{DNPM_IMAGE_TAG:-latest}
+    image: ghcr.io/dnpm-dip/backend:${DNPM_IMAGE_TAG:-latest}
     environment:
       - LOCAL_SITE=${ZPM_SITE}:${SITE_NAME}   # Format: {Site-ID}:{Site-name}, e.g. UKT:Tübingen
       - RD_RANDOM_DATA=${DNPM_SYNTH_NUM:--1}