# Prisma ORM 7.3.0: Faster queries, safer data, smoother upgrades

URL: https://www.prisma.io/blog/prisma-orm-7-3-0
Published: 2026-01-21
Authors: Mike Hartington
Tags: orm
Description: Prisma ORM 7.3.0 adds a new compilerBuild option (fast or small), speeds up raw queries by bypassing compilation, improves MSSQL and better-sqlite3 stability, reverts mapped enum behavior, and preserves BigInt precision in relationJoins JSON aggregation.

Prisma ORM 7.3.0 focuses on a theme we’ve been steadily pushing since 7.0: **performance improvements without sacrificing reliability**. This release introduces new ways to tune query compilation, reduces overhead for raw queries, includes important adapter updates, and ships a few correctness fixes that make upgrading and day-to-day usage smoother.

## Choose the right query compiler for your app [#choose-the-right-query-compiler-for-your-app]

One of the biggest changes in 7.3.0 is a new `compilerBuild` option in your Prisma Client generator. It lets you choose between two query compiler builds:

* **`fast`**: optimized for speed (default), with a larger footprint
* **`small`**: optimized for bundle size, trading off some performance

This is the first step in a larger set of performance work we’re continuing to roll out across the ORM.

```prisma
generator client {
  provider      = "prisma-client"
  output        = "../src/generated/prisma"
  compilerBuild = "fast" // "fast" | "small"
}
```

## Raw queries now skip unnecessary overhead [#raw-queries-now-skip-unnecessary-overhead]

If you’re using raw queries (`$executeRaw`, `$queryRaw`), 7.3.0 reduces the work Prisma has to do before sending your query to the database. Raw queries can now **bypass the query compiler and interpreter path** and go straight to the driver adapter, removing extra layers and trimming latency in raw-query heavy workloads.

## Adapter and platform updates [#adapter-and-platform-updates]

This release includes a couple of practical ecosystem improvements:

* **MSSQL adapter updated**: `@prisma/adapter-mssql` now uses MSSQL **v12.2.0**, thanks to community contributor [Jay-Lokhande](https://github.com/Jay-Lokhande).
* **SQLite stability fix for `better-sqlite3`**: an underlying SQLite 3.51.0 issue impacted the `better-sqlite3` adapter. Prisma 7.3.0 **bumps and pins** the dependency used by `@prisma/better-sqlite3` to prevent unexpected breakage. If you rely on this adapter, upgrading to 7.3.0 is strongly recommended.

## Mapped enums behavior reverted for compatibility [#mapped-enums-behavior-reverted-for-compatibility]

In Prisma 7.0, mapped enums changed how values were generated when using `@map`, which turned out to be a sharp edge for many users migrating from Prisma 6. In 7.3.0, we’ve **reverted that behavior** to restore the prior, more compatible semantics.

## BigInt precision preserved in JSON aggregation with relation joins [#bigint-precision-preserved-in-json-aggregation-with-relation-joins]

When using `relationJoins` with `BigInt` fields in Prisma 7, BigInt values could be returned as JSON numbers from PostgreSQL JSON aggregation, then **silently lose precision** when parsed in JavaScript (because values above `Number.MAX_SAFE_INTEGER` can’t be represented exactly).

In 7.3.0, BigInt fields are **cast to text inside JSON aggregation**, ensuring values come back as JSON strings and preserve full precision in JavaScript.

## Upgrade notes [#upgrade-notes]

* If you’re using `@prisma/better-sqlite3`, upgrading to **7.3.0** is recommended to avoid SQLite-related issues.
* If you had to work around Prisma 7.0 mapped enum changes, those workarounds may no longer be necessary in 7.3.0.
* Consider `compilerBuild = "small"` if bundle size matters more than raw performance (serverless/edge constraints), and stick with the default `fast` build for most production backends.

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