---
title: "Checking compatibility through replay"
description: "How can you detect new-code incompatibility using an old event history?"
status: "coming-soon"
language: "en"
canonical: "https://bulnik.dev/en/articles/topics/T16.02/"
topicId: "T16.02"
---

> Coming soon — this article is being prepared. Below are its question, intended outcome, and place in the story.

## The question

How can you detect new-code incompatibility using an old event history?

## What we will work through

Detect new-code incompatibility using an old event history.

## Before you begin

Previously covered: Event history and execution recovery; Unit testing a Workflow with controlled time.

- [Event history and execution recovery](/en/articles/topics/T14.03/)
- [Unit testing a Workflow with controlled time](/en/articles/topics/T16.01/)