# Prisma 2.21.0 — Release & Upgrade Intelligence
- **Product:** Prisma (https://prisma.io)
- **Version:** 2.21.0
- **Released:** Apr 13, 2021
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/prisma/updates/2.21.0/

## Executive Summary (TL;DR)
Prisma 2.21.0. Source highlight: Today, we are excited to share the `2.21.0` stable release 🎉

## Breaking Changes & Deprecations
- Breaking Changes ### Aggregates are now nullable

## New Features
- feat: enable pushing a list to a scalar list

## Improvements
- Improve error message in Prisma Migrate when a provider mismatch is detected

## Bug Fixes
- On PostgreSQL, when changing column types that are also in an index, Migrate would generate a `DROP COLUMN ..., ADD COLUMN ...` sequence of SQL statements. These silently drop the indexes present on the column, and migrate would only re-create them with the next migration. With this release, the issue has been fixed, and Migrate recreates the index in the same migration.
- Fix check for orderBy aggregate

## Upgrade Command
```bash
npm install --save-dev --save-exact prisma@2.21.0
```