Your Ruby version is 2.6.8, but your Gemfile specified 2.7.5

[BraveEvidence]

I just created a new react-native project for version 0.70
cd to iOS folder and tried running

bundle install && RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

I get an error saying

Your Ruby version is 2.6.8, but your Gemfile specified 2.7.5

When I tried to upgrade my ruby version via home-brew I get following message

Warning: ruby 3.1.2_1 already installed

Here is what I tried

brew upgrade
brew update
brew install ruby-build
brew install rbenv

rbenv install -l
sudo rbenv install 2.7.5

sudo rbenv global 2.7.5 => I get error saying rbenv: version `2.7.5' not installed

What else should I do to resolve this error

[fabOnReact]

I would refer to https://reactnative.dev/docs/environment-setup#cocoapods

inspect your $PATH variable with

echo $PATH

and verify what binary are you using when you run commands rbenv or sudo rbenv (which rbenv and rbenv which).

sudo rbenv global 2.7.5 => I get error saying rbenv: version `2.7.5' not installed

I would not use sudo with rbenv.
Go through the installation and troubleshooting steps in https://github.com/rbenv/rbenv

[BraveEvidence]

My setup is correct afaik because I am able to run the app both on android and iOS without the new architecture

After running echo $PATH, below is my output

/Library/Frameworks/Python.framework/Versions/3.9/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/transformhub/Desktop/flutter/bin :/usr/local/go/bin:/usr/local/share/dotnet:~/.dotnet/tools:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Applications/Postgres.app/Contents/Versions/latest/bin:/Users/transformhub/Library/Android/sdk/platform-tools:/Users/transformhub/Users/transformhub/Desktop/flutter/bin:/Users/transformhub/Android/Sdk/tools:/Users/transformhub/Android/Sdk/tools/bin:/Users/transformhub/Android/Sdk/platform-tools:/Library/Frameworks/Python.framework/Versions/3.9/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Users/transformhub/Desktop/flutter/bin:/Users/transformhub/.rvm/bin

Even if I don't use sudo for sudo rbenv global 2.7.5, I get the same error

[fabOnReact]

https://stackoverflow.com/a/19074129/7295772

/Users/transformhub/.rvm/bin

rbenv is not compatible with rvm
https://github.com/rbenv/rbenv#installation

you can also check this and other stackoverflow discussions

[BraveEvidence]

Thanks but I still don't understand why the issue is

I added

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

in my zsh

and also did brew install rbenv ruby-build which told me I already have

[BraveEvidence]

This is how is resolved the issue. First uninstall rvm and rbenv

Then follow this
Make sure you install the proper ruby version

Then add

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

as the last line in your .zshrc

Then run

env | grep PATH
rbenv global 2.7.6