Deprecation of protocol version 1 - November 2025
SDKs using version 1 of Ably’s realtime protocol will be sunset on 1st November 2025.
This version was superseded by version 2 in January 2023. It introduced new functionality, with a more efficient and scalable backend implementation. New features are not available using version 1 of the protocol, nor in any SDKs implementing it.
Affected SDKs
SDK versions earlier than those listed below are now considered deprecated. If you are using a version older than those listed, upgrade before the 1st November 2025.
| Product | Language | Versions |
|---|---|---|
| Pub/Sub | JavaScript | < 1.2.36 |
| Pub/Sub | Java | < 1.2.35 |
| Pub/Sub | Swift / Objective-C | < 1.2.24 |
| Pub/Sub | .NET | < 1.2.12 |
| Pub/Sub | Go | < 1.2.14 |
| Pub/Sub | Python | < 2.0.0-beta.6 |
| Pub/Sub | Ruby | < 1.2.5 |
| Pub/Sub | PHP | < 1.1.9 |
| Pub/Sub | Flutter | < 1.2.25 |
| Kafka Connect | – | < 2.1.4 |
Contact support if you have any questions.
Request failures
On the 1st November 2025 attempts to connect to Ably using an SDK that uses version 1 of the protocol will start to fail. Failures will be phased, with only a fraction of traffic being rejected at first, until 100% of requests are rejected after several weeks.
Requests that are rejected will contain an error message and code referencing this deprecation notice and the associated deprecation policy.