Just edit the Dockerfile and change ENV vars

docker build -t blynk .

docker run --name blynk-server -v ~/blynk-server/server/Docker:/data -p 8440:8440 -p 8080:8080 -p 9443:9443 -d blynk 

Don't forget to change the port attribution if you change on the ENV vars in Dockerfile

Stop and remove your actual container

docker stop blynk-server && docker rm blynk-server

• Edit your Blynk server version on the ENV var in Dockerfile
• Build & Launch

Have Fun ! ✌️ 🐳