Updating a nodejs image inside of a Dockerfile - node.js

Question

I am trying to update the node version that we are using inside the Dockerfile of my application. Currently it is set as v12.21.0. I would like to update it to v16.13.0 as that is the current node LTS version. Please see my dockerfile code below.
So I turned this:
FROM node:12.21.0-alpine as build
RUN apk --update add bash
WORKDIR /usr/src/app
COPY . .
RUN yarn
RUN yarn build
FROM opsline/tools:alpine AS tools
FROM node:12.21.0-alpine
RUN apk --update --no-cache add ca-certificates
WORKDIR /usr/src/app
COPY --from=tools /usr/local/bin/chalk /usr/local/bin/
COPY --from=tools /usr/local/bin/gosu /usr/local/bin/
COPY --from=build /usr/src/app/build ./build
COPY --from=build /usr/src/app/node_modules ./node_modules
COPY --from=build /usr/src/app/server ./server
COPY --from=build /usr/src/app/package.json .
COPY --from=build /usr/src/app/scripts/pre-start.js .
COPY ./docker/entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]
To This:
FROM node:16.13.0-alpine as build
RUN apk --update add bash
WORKDIR /usr/src/app
COPY . .
RUN yarn
RUN yarn build
FROM opsline/tools:alpine AS tools
FROM node:16.13.0-alpine
RUN apk --update --no-cache add ca-certificates
WORKDIR /usr/src/app
COPY --from=tools /usr/local/bin/chalk /usr/local/bin/
COPY --from=tools /usr/local/bin/gosu /usr/local/bin/
COPY --from=build /usr/src/app/build ./build
COPY --from=build /usr/src/app/node_modules ./node_modules
COPY --from=build /usr/src/app/server ./server
COPY --from=build /usr/src/app/package.json .
COPY --from=build /usr/src/app/scripts/pre-start.js .
COPY ./docker/entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]
Is it true that all I would have to do is change the node version manually in the code and the rest should fall into place? Any advice is appreciated. Thanks

Answer 1

Changing version will upgrade NodeJS if you are installing
but here your are using it as Base Image so you need to check whether such version is available in docker hub
If it is there we can use but 16.13.0-alpine is not there So I think you need to change version number to any version available at https://hub.docker.com/_/node