# Ray 2.6.1 — Ray-2.6.1

- Product: Ray (https://whatsnew.fyi/product/ray)
- Vendor: Anyscale
- Date: 2023-07-24
- Version: 2.6.1
- Original notes: https://github.com/ray-project/ray/releases/tag/ray-2.6.1
- Permalink: https://whatsnew.fyi/product/ray/releases/2.6.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — Fix cluster launcher failing to start multi-node clusters in Ray 2.6.0
- **fixed** — Fix autoscaler env variable overwrite not being usable if the command itself uses the env variable
- **fixed** — Fix Serve enum to_proto compatibility with Python 3.11

The Ray 2.6.1 patch release contains a critical fix for cluster launcher, and compatibility update for Ray Serve protobuf definition with python 3.11, as well doc improvements. 

⚠️  Cluster launcher in Ray 2.6.0 fails to start multi-node clusters. Please update to 2.6.1 if you plan to use 2.6.0 cluster launcher.


##### Ray Core
🔨 Fixes:
* [core][autoscaler] Fix env variable overwrite not able to be used if the command itself uses the env #37675


##### Ray Serve
🔨 Fixes:
* [serve] Cherry-pick Serve enum to_proto fixes for Python 3.11 #37660

##### Ray Air
📖Documentation:
* [air][doc] Update docs to reflect head node syncing deprecation #37475