---

name: posthog-upgrade-migration description: | Analyze, plan, and execute PostHog SDK upgrades with breaking change detection. Use when upgrading PostHog SDK versions, detecting deprecations, or migrating to new API versions. Trigger with phrases like "upgrade posthog", "posthog migration", "posthog breaking changes", "update posthog SDK", "analyze posthog version". allowed-tools: Read, Write, Edit, Bash(npm:), Bash(git:) version: 1.0.0 license: MIT author: Jeremy Longshore jeremy@intentsolutions.io

PostHog Upgrade & Migration

Overview

Guide for upgrading PostHog SDK versions and handling breaking changes.

Prerequisites

• Current PostHog SDK installed
• Git for version control
• Test suite available
• Staging environment

Instructions

Step 1: Check Current Version

npm list @posthog/sdk
npm view @posthog/sdk version

Step 2: Review Changelog

open https://github.com/posthog/sdk/releases

Step 3: Create Upgrade Branch

git checkout -b upgrade/posthog-sdk-vX.Y.Z
npm install @posthog/sdk@latest
npm test

Step 4: Handle Breaking Changes

Update import statements, configuration, and method signatures as needed.

Output

• Updated SDK version
• Fixed breaking changes
• Passing test suite
• Documented rollback procedure

Error Handling

SDK Version	API Version	Node.js	Breaking Changes
3.x	2024-01	18+	Major refactor
2.x	2023-06	16+	Auth changes
1.x	2022-01	14+	Initial release

Examples

Import Changes

// Before (v1.x)
import { Client } from '@posthog/sdk';

// After (v2.x)
import { PostHogClient } from '@posthog/sdk';

Configuration Changes

// Before (v1.x)
const client = new Client({ key: 'xxx' });

// After (v2.x)
const client = new PostHogClient({
  apiKey: 'xxx',
});

Rollback Procedure

npm install @posthog/sdk@1.x.x --save-exact

Deprecation Handling

// Monitor for deprecation warnings in development
if (process.env.NODE_ENV === 'development') {
  process.on('warning', (warning) => {
    if (warning.name === 'DeprecationWarning') {
      console.warn('[PostHog]', warning.message);
      // Log to tracking system for proactive updates
    }
  });
}

// Common deprecation patterns to watch for:
// - Renamed methods: client.oldMethod() -> client.newMethod()
// - Changed parameters: { key: 'x' } -> { apiKey: 'x' }
// - Removed features: Check release notes before upgrading

Resources

• PostHog Changelog
• PostHog Migration Guide

Next Steps

For CI integration during upgrades, see posthog-ci-integration.