Update docker/install-portioner.md

docker/install-portioner.md

@@ -30,3 +30,29 @@ https://localhost:9443
 ```
 
 Replace localhost with the IP Address or FQDN if needed.
+
+
+## Upgrading Portainer
+
+Documentation Resource: https://docs.portainer.io/start/upgrade/docker
+
+```
+docker stop portainer
+```
+
+```
+docker rm portainer
+```
+
+```
+docker pull portainer/portainer-ce:lts
+```
+
+```
+docker run -d -p 8000:8000 -p 9443:9443 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:lts
+```
+
+```
+docker system prune -a --volumes
+```
+