create-react-app proxy broken after installing poetry on osx - macos

Question

I'm using create-react-app with a backend application written on Python (using starlette, ariadne and uvicorn) on OSX.
The application was previously running using pipenv. After installing poetry through brew however (brew install poetry), it seems like CRA's proxy stopped working. I suspect this has something to do with homebrew but I have no idea what it is.
Here is my package.json config
{
"name": "chat-ariadne-frontend",
"version": "0.1.0",
"private": true,
"proxy": "http://localhost:8000",
"dependencies": {
"#apollo/client": "^3.5.10",
"#testing-library/jest-dom": "^5.16.2",
"#testing-library/react": "^12.1.3",
"#testing-library/user-event": "^13.5.0",
"antd": "^4.18.9",
"graphql": "^16.3.0",
"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-router": "^6.2.2",
"react-router-dom": "^6.2.2",
"react-scripts": "5.0.0",
"subscriptions-transport-ws": "^0.11.0",
"web-vitals": "^2.1.4"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": [
"react-app",
"react-app/jest"
]
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}
I'm running the server using poetry run uvicorn app. However, I get the following error in the console:
Proxy error: Could not proxy request /graphql from localhost:3000 to http://localhost:8000.
See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (ECONNREFUSED).
Node version
node -v
v17.6.0
Operating System
OS X Big Sur (version 11.5.2)
Homebrew configuration
HOMEBREW_VERSION: 3.4.1
ORIGIN: https://github.com/Homebrew/brew
HEAD: ea0ddc3297739b7380887d4a7e6b6590c314dca9
Last commit: 2 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 49d411c9fe7e7cd2fba32e76ecbcd5a049556b73
Core tap last commit: 3 hours ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_CORE_GIT_REMOTE: https://github.com/Homebrew/homebrew-core
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 2.6.8 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.8/bin/ruby
CPU: quad-core 64-bit kabylake
Clang: 13.0.0 build 1300
Git: 2.23.0 => /usr/local/bin/git
Curl: 7.64.1 => /usr/bin/curl
macOS: 11.5.2-x86_64
CLT: 13.2.0.0.1.1638488800
Xcode: N/A