# What changed in mongodb-memory-server-core

> 18 changes in mongodb-memory-server-core 10 to 11 from its official release notes, upgrade guides and advisories: 3 breaking, 1 security. Each one cited. Sources checked 2026-10-21. HTML: https://unstale.sh/npm/mongodb-memory-server-core/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## mongodb-memory-server-core 11

### Breaking changes

- The lowest supported Node.js version is now 20.19.0. (11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15)
- MongoDB versions below 4.2.0 are no longer supported. (11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15)
- The mongodb-memory-server-global-4.0 package was removed because it is unsupported by the MongoDB driver. (11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15)

### Security

- Binaries are checksummed during extraction and checked, helping detect invalid binaries. (11.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1130-2026-09-21)

### Behavior and default changes

- The MongoMemoryReplSet electionTimeoutMillis timeout is increased to 5000ms. (11.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1130-2026-09-21)
- The default 4.4 binary is updated to 4.4.30. (11.1.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1110-2026-04-29)
- The default MongoDB binary version is updated to 8.2.6. (11.1.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1110-2026-04-29)
- The default MongoDB binary version is now 8.2.1. (11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15)
- Resume downloads is enabled by default. (11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15)

### Fixes and other changes

- MongoInstance::stop now always unsets mongodProcess, changing process state after stopping. (11.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1130-2026-09-21)
- USE_HTTP requests now use the http module. (11.0.1) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1101-2025-12-23)
- Corrected the configuration mapping for RESUME_DOWNLOAD. (10.4.1, 11.0.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1100-2025-12-15), [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1041-2025-12-04)

## mongodb-memory-server-core 10

### Behavior and default changes

- The RESUME_DOWNLOAD option is stabilized. (10.4.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1040-2025-12-03)
- Updates the default MongoDB binary version to 7.0.24 and the default 4.2 and 4.4 binaries to 4.2.25 and 4.4.29. (10.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1030-2025-10-31)

### Fixes and other changes

- Adds a fallback version when determining the SUSE version string. (10.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1030-2025-10-31)
- Accounts for a known compatibility issue on SUSE 12 with MongoDB versions >=8.0.0. (10.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1030-2025-10-31)
- Accounts for known compatibility issues on SUSE 13 and 14. (10.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1030-2025-10-31)
- Silences ECONNRESET errors during shutdown. (10.3.0) — [release notes](https://github.com/typegoose/mongodb-memory-server/blob/adb334d8b9f10935ef90d0727f96ed6cdcd041b6/CHANGELOG.md#1030-2025-10-31)