diff --git a/ccp/nngm-compose.yml b/ccp/nngm-compose.yml
index 1f4cb73..6293707 100644
--- a/ccp/nngm-compose.yml
+++ b/ccp/nngm-compose.yml
@@ -17,7 +17,7 @@ services:
       - "traefik.http.services.connector.loadbalancer.server.port=8080"
       - "traefik.http.routers.connector.tls=true"
     volumes:
-      - /etc/bridgehead/trusted-ca-certs:/custom-certs
+      - /etc/bridgehead/trusted-ca-certs:/custom-certs:ro
 
   connector_db:
     image: postgres:9.5-alpine