Install MySQL 5.7 on macOS 26(Tahoe) using Homebrew

Install_MySQL_5-7_macOS_26_Tahoe.md

It is now September 18, 2025, three days after the release of macOS 26 (Tahoe). Due to a few legacy projects, I still need to use MySQL 5.7 in 2025.

Homebrew has long since dropped support for MySQL 5.7. The old method of installing via brew tap homebrew/core --force and then modifying mysql@5.7.rb no longer works, and brew edit mysql@5.7 is also broken.

Thanks to ferrucc-io's reply, I refined and tested the steps myself and got MySQL 5.7.44 up and running on macOS 26.

For anyone who runs into the same issue, I’m documenting here：

brew tap homebrew/core --force
curl -fL "https://raw.githubusercontent.com/Homebrew/homebrew-core/6c907880b95a3702348c1fcce1c661fcc03336e5/Formula/m/mysql%405.7.rb"  -o "/opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/m/mysql@5.7.rb"
sed -i '' '/disable! date: "2024-08-01", because: :unsupported/d' /opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/m/mysql@5.7.rb
curl -fL "https://raw.githubusercontent.com/Homebrew/homebrew-core/6c907880b95a3702348c1fcce1c661fcc03336e5/Formula/o/openssl%401.1.rb"   -o "/opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/o/openssl@1.1.rb"
sed -i '' '/disable! date: "2024-10-24", because: :unsupported/d' /opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/o/openssl@1.1.rb

brew tap-new local/old-openssl
cp /opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/o/openssl@1.1.rb \
   $(brew --repository local/old-openssl)/Formula/openssl@1.1.rb
brew install local/old-openssl/openssl@1.1

brew tap-new local/old-mysql
cp /opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/m/mysql@5.7.rb \
   $(brew --repository local/old-mysql)/Formula/mysql@5.7.rb
brew install local/old-mysql/mysql@5.7

echo 'export PATH="/opt/homebrew/opt/mysql@5.7/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc
brew services start local/old-mysql/mysql@5.7

mysql_secure_installation

macos26 still not supported

Just tried with MacOS 26.5.1 - on step brew install local/old-mysql/mysql@5.7 I receive no_autobump! can only be used in official Homebrew taps
Homebrew now rejects no_autobump! in non-official taps, which is exactly why local/old-mysql fails. The guide removes only disable!, but the raw MySQL formula also contains no_autobump!.
Run this after copying the MySQL formula into your local tap, before brew install:

MYSQL_FORMULA="$(brew --repository local/old-mysql)/Formula/mysql@5.7.rb"

sed -i '' '/^[[:space:]]*no_autobump!.*$/d' "$MYSQL_FORMULA"