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When I'm trying install dependencies i have this error:

npm WARN sass-loader@5.0.1 requires a peer of webpack@^2.0.0 but none
is installed. You must install peer dependencies yourself.

I'm trying to install webpack@2.6.1, I also install it globally but it still doesn't work

• webpack@2.6.1 added 5 packages, removed 43 packages and updated 22 packages in 17.162s

 "name": "series",
 "version": "1.0.0",
 "description": "A Vue.js project",
 "author": "Kawka <kaawkamateusz@gmail.com>",
 "private": true,
 "scripts": 
 "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
 "start": "npm run dev",
 "unit": "jest --config test/unit/jest.conf.js --coverage",
 "test": "npm run unit",
 "lint": "eslint --ext .js,.vue src test/unit/specs",
 "build": "node build/build.js"
 ,
 "dependencies": 
 "axios": "^0.17.1",
 "vue": "^2.5.2",
 "vue-bulma-typeahead": "0.0.7",
 "vue-router": "^3.0.1"
 ,
 "devDependencies": 
 "autoprefixer": "^7.1.2",
 "babel-core": "^6.22.1",
 "babel-eslint": "^7.1.1",
 "babel-helper-vue-jsx-merge-props": "^2.0.3",
 "babel-jest": "^21.0.2",
 "babel-loader": "^7.1.1",
 "babel-plugin-dynamic-import-node": "^1.2.0",
 "babel-plugin-syntax-jsx": "^6.18.0",
 "babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
 "babel-plugin-transform-runtime": "^6.22.0",
 "babel-plugin-transform-vue-jsx": "^3.5.0",
 "babel-preset-env": "^1.3.2",
 "babel-preset-stage-2": "^6.22.0",
 "chalk": "^2.0.1",
 "copy-webpack-plugin": "^4.0.1",
 "css-loader": "^0.28.0",
 "eslint": "^3.19.0",
 "eslint-config-standard": "^10.2.1",
 "eslint-friendly-formatter": "^3.0.0",
 "eslint-loader": "^1.7.1",
 "eslint-plugin-html": "^3.0.0",
 "eslint-plugin-import": "^2.7.0",
 "eslint-plugin-node": "^5.2.0",
 "eslint-plugin-promise": "^3.4.0",
 "eslint-plugin-standard": "^3.0.1",
 "extract-text-webpack-plugin": "^3.0.0",
 "file-loader": "^1.1.4",
 "friendly-errors-webpack-plugin": "^1.6.1",
 "html-webpack-plugin": "^2.30.1",
 "jest": "^21.2.0",
 "jest-serializer-vue": "^0.3.0",
 "node-notifier": "^5.1.2",
 "node-sass": "^4.7.2",
 "optimize-css-assets-webpack-plugin": "^3.2.0",
 "ora": "^1.2.0",
 "portfinder": "^1.0.13",
 "postcss-import": "^11.0.0",
 "postcss-loader": "^2.0.8",
 "postcss-url": "^7.2.1",
 "rimraf": "^2.6.0",
 "sass-loader": "^6.0.6",
 "semver": "^5.3.0",
 "shelljs": "^0.7.6",
 "style-loader": "^0.19.1",
 "uglifyjs-webpack-plugin": "^1.1.1",
 "url-loader": "^0.5.8",
 "vue-jest": "^1.0.2",
 "vue-loader": "^13.3.0",
 "vue-style-loader": "^3.0.1",
 "vue-template-compiler": "^2.5.2",
 "webpack": "^3.10.0",
 "webpack-bundle-analyzer": "^2.9.0",
 "webpack-dev-server": "^2.9.1",
 "webpack-merge": "^4.1.0"
 ,
 "engines": 
 "node": ">= 6.0.0",
 "npm": ">= 3.0.0"
 ,
 "browserslist": [
 "> 1%",
 "last 2 versions",
 "not ie <= 8"
 ]