# How to Update Gemini CLI Safely (Latest, Preview & Nightly Guide)

If you're using Gemini CLI regularly, keeping it updated is important. New releases often include bug fixes, authentication improvements, model updates, and new features.

In this guide, you'll learn:

*   How to check your current Gemini CLI version
    
*   How to update to the latest release
    
*   How to install Preview and Nightly builds
    
*   How to roll back to a previous version
    
*   Common update issues and how to fix them
    

## TL;DR

Update Gemini CLI:

```plaintext
gemini update
```

Or install the latest version directly:

```plaintext
npm install -g @google/gemini-cli@latest
```

Verify the update:

```plaintext
gemini --version
```

If something breaks after updating:

```plaintext
npm install -g @google/gemini-cli@0.39.0
```

## Check Your Current Gemini CLI Version

Before updating, check which version you're currently running:

```plaintext
gemini --version
```

You'll see output similar to:

```plaintext
Gemini CLI v0.40.0
```

If you're already on the latest version, no further action is required.

## Update Gemini CLI to the Latest Version

The easiest way to update Gemini CLI is:

```plaintext
gemini update
```

Once completed, verify the update:

```plaintext
gemini --version
```

This ensures you're running the newest stable release.

## Install the Latest Version via npm

If the built-in update command isn't available, install the latest version manually:

```plaintext
npm install -g @google/gemini-cli@latest
```

After installation:

```plaintext
gemini --version
```

## Install Preview Releases

Preview releases allow you to test upcoming features before they reach the stable channel.

```plaintext
npm install -g @google/gemini-cli@preview
```

Preview versions may contain experimental functionality and occasional bugs.

## Install Nightly Builds

Nightly builds include the newest code changes and are intended for testing purposes.

```plaintext
npm install -g @google/gemini-cli@nightly
```

Use Nightly builds only if you want early access to features or are actively providing feedback.

## How to Roll Back Gemini CLI

Sometimes a new version introduces unexpected issues.

To return to a previous version:

```plaintext
npm install -g @google/gemini-cli@0.39.0
```

Replace the version number with whichever release you need.

Verify:

```plaintext
gemini --version
```

Rollback support is particularly useful when testing Preview or Nightly releases.

## Common Update Errors

### gemini: command not found

Check whether Gemini CLI is installed globally:

```plaintext
npm list -g @google/gemini-cli
```

If it's missing, reinstall:

```plaintext
npm install -g @google/gemini-cli@latest
```

### npm ERR! EACCES

Permission errors typically indicate a global npm configuration issue.

Instead of using sudo, consider:

*   Using nvm
    
*   Reinstalling Node.js correctly
    
*   Adjusting npm permissions
    

### Unsupported Node Version

Check your current Node.js version:

```plaintext
node -v
```

If your Node version is outdated, upgrade Node.js before updating Gemini CLI.

## Recommended Update Strategy

For most developers:

*   Use Latest for production workflows
    
*   Use Preview when testing upcoming features
    
*   Use Nightly only for experimentation
    

A stable version should remain your primary environment, while Preview and Nightly builds are better suited for testing.

## Conclusion

Keeping Gemini CLI updated ensures access to the latest improvements, security updates, and model capabilities.

For most users, running:

```plaintext
gemini update
```

or

```plaintext
npm install -g @google/gemini-cli@latest
```

is all that's needed to stay current.

If issues arise, rolling back to a previous version is straightforward and can help maintain a stable development workflow.

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