---
title: "postgres Breaking Changes on npm | Since.dev"
description: "What each postgres release removed, renamed or changed: 150 breaking changes in 1 version on npm, each with its source."
canonical_url: https://since.dev/packages/npm/postgres
last_updated: 2026-11-03
---

# postgres breaking changes

Every breaking API change we have recorded in postgres on npm: 150 breaking changes in 1 version. Below are its newest version, removals and renames first, each with its source.

Newest change November 3, 2026

## 4.0.0

150 breaking changes, first published November 3, 2026.

- **Removed**  

Postgres.js is now an ES module only. Code that loads the CommonJS build must use require('postgres').default or an ES module import. [github.com](https://github.com/porsager/postgres/releases/tag/v4.0.0)
- **Removed** `ArrayParameter`  

ArrayParameter was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `AuthNotImplementedError`  

AuthNotImplementedError was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `BigInt`  

BigInt was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `camel`  

camel was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `Column`  

Column was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `ColumnInfo`  

ColumnInfo was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `ColumnList`  

ColumnList was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `ConnectionError`  

ConnectionError was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)
- **Removed** `ConnectionParameters`  

ConnectionParameters was removed in postgres 4.0.0 [npmjs.com](https://www.npmjs.com/package/postgres/v/4.0.0)

And 140 more in this version.

## Check your code

These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.

## Put your code on continuous management.

Scan a public repository now, or give your agent one line.

### See how out of date your code is.

[Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in.

### Tell your agent what changed since it was trained.

`claude mcp add --transport http since https://api.since.dev/mcp`

---

Every page on this site as Markdown: https://since.dev/sitemap.md. For agents: https://since.dev/llms.txt.