How to stop Heroku from trying to install husky

I have a Node app(React) on Heroku and the deploy and build was previous working fine, I have now added Husky, Lint-staged, Craco and WDYR to a new branch which works locally.

Upon trying to deploy and build this branch on Heroku, I am finding that the build fails due to Heroku trying to install Husky despite me not asking it to and it being a development tool. It makes sense that Heroku cannot find Husky as it is a dev dependency.

From what I can see Heroku is running the prepare script from the client package.json, which it shouldn't be.

I would like to know how I can stop Heroku from trying to install Husky?

Please help.

Here are my package.json files (haven't included server package.json as not sure it's relevant)

root

{
"engines": {
    "node": "12.x"
},
"scripts": {
    "start": "cd server && node server.js",
    "build": "cd client && npm run build",
    "install-server": "cd server && npm ci",
    "install-client": "cd client && npm ci",
    "heroku-postbuild": "npm run install-server && npm run install-client && npm run build"
}

}

client

{
"name": "qupp",
"version": "1.0.0",
"description": "App that allows users to create playlists using Spotify's API",
"engines": {
    "node": "12.x"
},
"scripts": {
    "build:css": "postcss src/App.scss -o src/index.css",
    "watch:css": "postcss src/App.scss -o src/index.css -w",
    "start_new": "PORT=3002 craco start",
    "start": "npm run watch:css & PORT=3002 craco start",
    "build": "npm run build:css && craco build",
    "test": "craco test",
    "eject": "react-scripts eject",
    "prepare": "cd ../ && husky install ./client/.husky"
},
"proxy": "http://127.0.0.1:8082/",
"author": "Daniel Blythe",
"license": "ISC",
"dependencies": {
    "@craco/craco": "^6.3.0",
    "@types/jest": "^24.0.17",
    "@types/materialize-css": "^1.0.6",
    "@types/node": "^12.7.1",
    "@types/react": "^16.9.1",
    "@types/react-dom": "^16.8.5",
    "axios": "^0.18.0",
    "babel-preset-es2015-node6": "^0.4.0",
    "classnames": "^2.2.6",
    "dotenv": "^6.1.0",
    "firebase": "^8.2.4",
    "http2": "^3.3.7",
    "jwt-decode": "^2.2.0",
    "morgan": "^1.9.1",
    "node-pre-gyp": "^0.11.0",
    "node-sass": "^4.9.4",
    "postcss-cli": "^6.1.3",
    "prop-types": "^15.6.2",
    "ramda": "^0.27.1",
    "re-base": "^4.0.0",
    "react": "^16.8.4",
    "react-dom": "^16.8.4",
    "react-dropzone": "^10.0.0",
    "react-materialize": "^3.3.3",
    "react-redux": "^6.0.0",
    "react-router-dom": "^4.3.1",
    "react-scripts": "4.0.3",
    "react-spotify-player": "^1.0.4",
    "react-transition-group": "^2.5.0",
    "redux": "^4.0.1",
    "redux-thunk": "^2.3.0",
    "source-map-support": "^0.5.9",
    "typescript": "^3.5.3"
},
"devDependencies": {
    "@types/classnames": "^2.2.9",
    "@types/react-redux": "^7.1.2",
    "@welldone-software/why-did-you-render": "^6.2.1",
    "autoprefixer": "^9.8.6",
    "enzyme": "^3.9.0",
    "enzyme-adapter-react-16": "^1.13.0",
    "enzyme-to-json": "^3.3.5",
    "eslint-config-prettier": "^8.3.0",
    "eslint-plugin-no-autofix": "^1.1.2",
    "eslint-plugin-prettier": "^3.4.1",
    "husky": "^7.0.2",
    "jest-dom": "^3.2.2",
    "lint-staged": "^11.1.2",
    "postcss": "^7.0.36",
    "postcss-cli": "^6.1.2",
    "prettier": "^2.3.2",
    "pretty-quick": "^3.1.1",
    "react-test-renderer": "^16.8.6",
    "react-testing-library": "^7.0.0",
    "tailwindcss": "npm:@tailwindcss/postcss7-compat@^2.2.14"
},
"jest": {
    "snapshotSerializers": [
        "enzyme-to-json/serializer"
    ]
},
"browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
]

}

Here is a screenshot of the error