PyPI · pypi:msgspec

msgspec active

A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML.

The latest stable version of msgspec is 0.22.0, published on 2026-09-29. Verified by Vigia on 2026-11-13.

Latest stable version	0.22.0
Published	2026-09-29 14:12:07 UTC
Install	`pip install --upgrade msgspec`
Requires	`python >=3.10`
License	BSD-3-Clause
Advisories on latest version	none known
Last verified	2026-11-13 19:08:06 UTC
Sources	pypi.org

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Maintenance

Activity	active
Last stable release	2026-09-29 14:12:07 UTC · 45 days ago
Stable releases in the last 12 months	4
Published versions	41

Heuristic based only on release dates; it does not measure issue or security response times.

Version history

Version	Published
`0.22.0`	2026-09-29 14:12:07 UTC
`0.21.1`	2026-04-12 21:43:45 UTC
`0.21.0`	2026-04-08 19:56:43 UTC
`0.20.0`	2025-11-24 03:55:08 UTC
`0.19.0`	2024-12-27 17:39:13 UTC
`0.18.6`	2024-01-22 04:34:07 UTC
`0.18.5`	2023-12-13 04:36:52 UTC
`0.18.4`	2023-10-05 05:13:34 UTC
`0.18.3`	2023-10-03 08:20:12 UTC
`0.18.2`	2023-08-26 21:38:16 UTC
`0.18.1`	2023-08-16 05:54:00 UTC
`0.18.0`	2023-08-10 21:29:35 UTC
`0.17.0`	2023-07-12 01:26:44 UTC
`0.16.0`	2023-06-12 15:29:24 UTC
`0.15.1`	2023-05-19 18:18:04 UTC
`0.15.0`	2023-05-10 17:57:19 UTC
`0.14.2`	2023-04-20 02:55:21 UTC
`0.14.1`	2023-04-07 16:29:49 UTC
`0.14.0`	2023-04-02 21:31:14 UTC
`0.13.1`	2023-02-10 06:55:28 UTC

Showing the 20 most recent of 41 versions. JSON

Version compatibility

Newest stable version that declares support for each runtime version (from the requirements published with each version).

Runtime	Newest compatible version
`python 3.8`	`0.18.6`
`python 3.9`	`0.20.0`
`python 3.10`	`0.22.0`
`python 3.11`	`0.22.0`
`python 3.12`	`0.22.0`
`python 3.13`	`0.22.0`

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Frequently asked questions

What is the latest version of msgspec?

The latest stable version of msgspec is 0.22.0, published on 2026-09-29. Verified by Vigia on 2026-11-13.

How do I install the latest version of msgspec?

Run pip install --upgrade msgspec. The latest stable version is 0.22.0 (verified 2026-11-13).

Is msgspec deprecated?

No. msgspec is not marked as deprecated in the registry.

Which Python version does msgspec require?

msgspec 0.22.0 declares this requirement: python >=3.10.

Does msgspec 0.22.0 have known vulnerabilities?

No known advisories affect msgspec 0.22.0 according to the data Vigia checks.

Is msgspec still maintained?

msgspec published 4 stable releases in the last 12 months; the most recent was 45 days ago. Activity: active.

Observed changes

ue Sep 29 2026 14:15:02 GMT+0000 (Coordinated Universal Time) — released 0.21.1 → 0.22.0

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