Error: PostCSS plugin autoprefixer requires PostCSS 8. Update PostCSS or downgrade this plugin

Question

I am getting this error whenever I run npm start. I tried a couple of fixes but none of them work for me. I tried to change the version of autoprefixer to 9.8.6 but it didn't work. Please help me with this issue

This is my package.json

{
  "name": "reactgallery",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-scripts": "3.4.3"
  },
  "scripts": {
    "start": "npm run watch:css && react-scripts start",
    "build": "npm run build:css && react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject",
    "build:css": "postcss src/assets/tailwind.css -o src/assets/main.css",
    "watch:css": "postcss src/assets/tailwind.css -o src/assets/main.css"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "autoprefixer": "^9.8.6",
    "postcss-cli": "^7.1.2",
    "tailwindcss": "^1.8.10"
  }
}

score 117 · Accepted Answer · answered Sep 26 '20 at 07:27

117

Quick fix

Downgrade your autoprefixer to version 9, use

"autoprefixer": "^9.0.0"

in your dev dependencies.

More details

PostCSS was updated to version 8, however, PostCSS CLI has not yet been updated to handle PostCSS plugins which use the new PostCSS 8+ API. Autoprefixer uses the new PostCSS 8 API since version 10.

This is documented under known issues in the PostCSS GitHub page.

Once PostCSS CLI is updated to handle plugins that use the new PostCSS 8+ API, this will likely not be an issue. But until then, you may need to downgrade some PostCSS plugins to avoid errors.

answered Sep 26 '20 at 07:27

chyke007

1,478
1
8
16

4

Thanks for your response.This didn't work for me. I'm still getting this error. Error: PostCSS plugin autoprefixer requires PostCSS 8. Update PostCSS or downgrade this plugin. – r121 Sep 29 '20 at 01:58
@RishiPurwar did you delete your node_modules folder and run `npm install` or `yarn install` ? – Franco Sep 30 '20 at 06:03
1

Update: postcss-cli v8 supports postcss v8 – RyanZim Dec 07 '20 at 15:17
1

Yes, postcss-cli v8 currently supports postcss v8 – chyke007 Dec 07 '20 at 15:20
"@tailwindcss/postcss7-compat": "^2.2.4", "autoprefixer": "^9.8.6", "postcss": "^7.0.35", use these combination. it should work.. – Rahul Manas Jul 19 '21 at 10:06
`npm install --save-dev autoprefixer@^9.0.0` helped me – Sultan Dadakhanov Aug 29 '21 at 18:55

score 41 · Answer 2 · answered Sep 25 '20 at 03:56

41

I am not sure about this but can you try installing postcss as a dependency?

npm i postcss

answered Sep 25 '20 at 03:56

BLelouch

431
3
5

score 40 · Answer 3 · answered Nov 26 '20 at 10:55

40

If you're having this problem and you're using Tailwind CSS v2, try this

npm uninstall tailwindcss postcss autoprefixer
npm install tailwindcss@npm:@tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9

source: https://tailwindcss.com/docs/installation#post-css-7-compatibility-build

answered Nov 26 '20 at 10:55

Arwildo

826
9
8

2

when you run the command in MacOS, you might encounter the issue `zsh: no matches found: postcss@^7`. try to run this `npm install tailwindcss@npm:@tailwindcss/postcss7-compat 'postcss@^7' 'autoprefixer@^9'` reference: https://github.com/tailwindlabs/tailwindcss/discussions/3575 – Ryan Lyu Sep 12 '21 at 11:52

david pincheira · Answer 4 · 2020-10-04T02:03:27.057

10

Ok, to me was fixed removing package-lock.json and installing:

"tailwindcss": "^1.8.10"
"postcss-cli": "^7.1.0"
"autoprefixer": "^9.7.5"

edited Oct 04 '20 at 02:03

answered Oct 04 '20 at 00:59

david pincheira

171
1
6

1

Removing the package-lock did it for me. But I'm using ^9.8.5. – Enrico Oct 19 '20 at 08:54

score 8 · Answer 5 · edited Dec 15 '20 at 07:55

8

"dependencies": {
    "autoprefixer": "^9.8.6",
    "postcss": "^8.0.0",
    "postcss-cli": "^8.1.0",
    "tailwindcss": "npm:@tailwindcss/postcss7-compat@^2.0.2",
},

Dependecies object and version can be modified directly in the package.json file and it work

edited Dec 15 '20 at 07:55

fcdt

2,371
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answered Dec 15 '20 at 06:31

Prashant singh

81
1
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in April 2021, this was the only combination working for me without error in a react-tailwind setup, probably due to the tailwind-compat-build. – Ingo Steinke Apr 11 '21 at 17:34

score 7 · Answer 6 · answered Dec 01 '20 at 09:58

These steps worked for me. This was from github

npm uninstall tailwindcss postcss autoprefixer
npm install tailwindcss@latest postcss@latest autoprefixer@latest

npx tailwindcss init -p

npm uninstall tailwindcss postcss autoprefixer
npm install tailwindcss@npm:@tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9

score 5 · Answer 7 · answered Nov 14 '20 at 18:24

5

Based on documentation link are drop some support for old NodeJS and you must upgrade manually the packages. Example in my case for a project based on webpack need just to update those dependencies:

  "dependencies": {
    "autoprefixer": "^10.0.2",
    "postcss": "^8.1.7",
    "postcss-loader": "^4.0.4"
  }

So you do not need to downgrade autoprefixer :)

answered Nov 14 '20 at 18:24

onalbi

2,609
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Works for me - was not able to add "post-css" package via terminal but after adding the line manually into package.json and reinstalling everything was fine. – Luckyfella Nov 20 '20 at 10:44
YAY! Thank you! This actually worked. This has been haunting me for what feels like years. This works with gulp-postcss plugin which is great :) To think the answer was as simple as "just manually install the packages" – Daniel Tonon Aug 25 '21 at 12:49

score 4 · Answer 8 · answered Oct 15 '20 at 01:49

4

the following combo works as of Oct 2020

  ...
  "dependencies": {
    "autoprefixer": "^9.8.6",
    "postcss-cli": "^8.1.0",
    "tailwindcss": "^1.9.2"
  }

answered Oct 15 '20 at 01:49

Alex Nolasco

18,750
9
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81

score 2 · Answer 9 · answered Nov 23 '20 at 07:10

2

For Next.js 10 you just have to do

npm install tailwindcss@latest postcss@latest autoprefixer@latest

Source This issue here

answered Nov 23 '20 at 07:10

Makuza Mugabo verite

218
3
4

score 2 · Answer 10 · answered Mar 19 '21 at 04:13

2

Using the official solution fix for PostCSS 7 compatibility build

yarn remove tailwindcss postcss autoprefixer
yarn add -D tailwindcss@npm:@tailwindcss/postcss7-compat @tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9

answered Mar 19 '21 at 04:13

ITW

432
5
12

score 1 · Answer 11 · answered Nov 28 '20 at 17:49

1

I had this problem with Laravel-mix 5 and PostCSS 8 and Tailwind 2.
With Laravel-mix 6 (beta at the moment) this was solved.

npm install laravel-mix@next --save-dev

answered Nov 28 '20 at 17:49

roeland

6,058
7
50
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score -1 · Answer 12 · answered Feb 02 '22 at 01:54

-1

Its Simple,

npm install postcss@^8

It worked very well for me.

answered Feb 02 '22 at 01:54

Shagun Sharma

19
3

Error: PostCSS plugin autoprefixer requires PostCSS 8. Update PostCSS or downgrade this plugin

12 Answers12

Quick fix

More details

Linked