Software⏱️ 2 min read📅 2026-05-31

How to Fix: How to install a gem or update RubyGems if it fails with a permissions error

Install a gem or update RubyGems with permissions error solution.

Quick Answer: Run the command as an administrator or use sudo to gain write permissions.

📋 Table of Contents

  1. ✅ Best Solutions to Fix It
  2. 🎯 Final Words

Installing gems or updating RubyGems can be a frustrating experience when you encounter a permissions error. This issue typically arises due to the lack of write access to the system's gem directory.

✅ Best Solutions to Fix It

Method 1: Changing Permissions

  1. Step 1: Open the Terminal and navigate to the directory where RubyGems is installed, which is usually /usr/local/bin/ruby or /usr/bin/ruby.

Method 1: Changing Permissions (continued)

  1. Step 2: Run the command sudo chown -R root:staff /usr/local/lib/ruby/gems/2.0.0 to change the ownership of the gem directory.

Method 2: Using sudo

  1. Step 1: Run the command gem install mygem --install-location /usr/local/lib/ruby/gems/2.0.0 to install the gem in a specific location.

Method 3: Using sudo with RubyGems Update

  1. Step 1: Run the command sudo gem update --system --install-location /usr/local/lib/ruby/gems/2.0.0 to update RubyGems in a specific location.

🎯 Final Words

By implementing one of these methods, you should be able to resolve the permissions error and successfully install gems or update RubyGems.

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