brew update fails

[TheVeridian]

Output of brew config

❯ brew config
HOMEBREW_VERSION: 4.0.10-119-g931327d
ORIGIN: https://github.com/Homebrew/brew
HEAD: 931327df1f30a3a5b1aa07657c0d1070e61988f9
Last commit: 67 minutes ago
Core tap origin: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 25be650e536c44d8294ad15be81243c14aeff69d
Core tap last commit: 6 weeks ago
Core tap branch: master
Core tap JSON: 27 Mar 19:21 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 8
Homebrew Ruby: 2.6.10 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: octa-core 64-bit arm_firestorm_icestorm
Clang: 14.0.0 build 1400
Git: 2.37.1 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 7.87.0 => /usr/bin/curl
macOS: 13.3-arm64
CLT: 14.2.0.0.1.1668646533
Xcode: N/A
Rosetta 2: false
╭─    ~                                                                 ✔  13:45:03  
╰─

Output of brew doctor

❯ brew doctor
Warning: Calling plist_options is deprecated! Use service.require_root instead.
Please report this issue to the koekeishiya/formulae tap (not Homebrew/brew or Homebrew/homebrew-core), or even better, submit a PR to fix it:
  /opt/homebrew/Library/Taps/koekeishiya/homebrew-formulae/skhd.rb:26

Warning: Calling plist_options is deprecated! Use service.require_root instead.
Please report this issue to the koekeishiya/formulae tap (not Homebrew/brew or Homebrew/homebrew-core), or even better, submit a PR to fix it:
  /opt/homebrew/Library/Taps/koekeishiya/homebrew-formulae/yabai.rb:42

Your system is ready to brew.

Description of issue

Figured I would run an update like usual after another shell command crashed randomly just to check, and received this output.
I attempted reinstalling, and received the same issue in the end.

❯ brew update
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/shims/utils.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
error: cannot fork() for remote-https: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
Error: Can't find a working Curl!
error: cannot fork() for remote-https: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
error: cannot fork() for remote-https: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
error: cannot fork() for remote-https: Resource temporarily unavailable
Error: Can't find a working Curl!
/opt/homebrew/Library/Homebrew/cmd/update.sh: fork: Resource temporarily unavailable
╭─    ~   128 ✘  13:40:46  
╰─ error: cannot fork() for remote-https: Resource temporarily unavailable

[TheVeridian]

Reinstalling commandline tools and retrying solved the issue.