Dokku/Docker deploying apps fails

Docker noob here so bear with me.

I have a VPS with dokku configured, it has multiple apps already running.
I am trying to add a fairly complex app at present. But docker just fails with the following error.

From what I understand I need to update the packages the error is given. Problem is they are needed by some other module and I cant update it. Is a way to make docker bypass the warning and build.

Following is the content of my docker

FROM mhart/alpine-node:6

# Create app dir
RUN mkdir -p /app
WORKDIR /app

# Install dependancy
COPY package.json /app
RUN npm install

# Bundle the app
COPY . /app

EXPOSE 9337

CMD ["npm", "start"]

Been trying this for a couple of days not with no success.
Any help greatly appreciated

Thanks.