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1 | 1 | # Changelog |
2 | 2 |
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3 | | -| Version | Release date | Bundle size (UMD min+gzip) | |
4 | | -|-------------------------------------------------------------------------------------------------------------|----------------|----------------------------| |
5 | | -| [6.6.4](#664-2025-12-23) | December 2025 | `8.7 KB` | |
6 | | -| [6.6.3](#663-2025-01-23) | January 2025 | `8.7 KB` | |
7 | | -| [6.6.2](#662-2024-10-23) | October 2024 | `8.7 KB` | |
8 | | -| [6.6.1](#661-2024-09-21) | September 2024 | `8.7 KB` | |
9 | | -| [6.6.0](#660-2024-06-21) | June 2024 | `8.6 KB` | |
10 | | -| [6.5.4](#654-2024-06-18) (from the [6.5.x](https://github.com/socketio/engine.io-client/tree/6.5.x) branch) | June 2024 | `8.8 KB` | |
11 | | -| [3.5.4](#354-2024-06-18) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | June 2024 | `-` | |
12 | | -| [6.5.3](#653-2023-11-09) | November 2023 | `8.8 KB` | |
13 | | -| [6.5.2](#652-2023-08-01) | August 2023 | `8.8 KB` | |
14 | | -| [6.5.1](#651-2023-06-28) | June 2023 | `8.4 KB` | |
15 | | -| [6.5.0](#650-2023-06-16) | June 2023 | `7.8 KB` | |
16 | | -| [6.4.0](#640-2023-02-06) | February 2023 | `7.8 KB` | |
17 | | -| [6.3.1](#631-2023-02-04) | February 2023 | `7.8 KB` | |
18 | | -| [6.3.0](#630-2023-01-10) | January 2023 | `8.0 KB` | |
19 | | -| [6.2.3](#623-2022-10-13) | October 2022 | `7.8 KB` | |
20 | | -| [3.5.3](#353-2022-09-07) | September 2022 | `-` | |
21 | | -| [6.2.2](#622-2022-05-02) | May 2022 | `7.8 KB` | |
22 | | -| [6.2.1](#621-2022-04-17) | April 2022 | `7.8 KB` | |
23 | | -| [6.2.0](#620-2022-04-17) | April 2022 | `7.8 KB` | |
24 | | -| [6.0.3](#603-2021-11-14) (from the [6.0.x](https://github.com/socketio/engine.io-client/tree/6.0.x) branch) | November 2021 | `7.4 KB` | |
25 | | -| [6.1.1](#611-2021-11-14) | November 2021 | `7.4 KB` | |
26 | | -| [6.1.0](#610-2021-11-08) | November 2021 | `7.4 KB` | |
27 | | -| [6.0.2](#602-2021-10-15) | October 2021 | `7.4 KB` | |
28 | | -| [6.0.1](#601-2021-10-14) | October 2021 | `7.4 KB` | |
29 | | -| [**6.0.0**](#600-2021-10-08) | October 2021 | `7.5 KB` | |
30 | | -| [5.2.0](#520-2021-08-29) | August 2021 | `9.4 KB` | |
31 | | -| [5.1.2](#512-2021-06-24) | June 2021 | `9.3 KB` | |
32 | | -| [5.1.1](#511-2021-05-11) | May 2021 | `9.2 KB` | |
33 | | -| [4.1.4](#414-2021-05-05) (from the [4.1.x](https://github.com/socketio/engine.io-client/tree/4.1.x) branch) | May 2021 | `9.1 KB` | |
34 | | -| [3.5.2](#352-2021-05-05) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | May 2021 | `-` | |
35 | | -| [5.1.0](#510-2021-05-04) | May 2021 | `9.2 KB` | |
36 | | -| [5.0.1](#501-2021-03-31) | March 2021 | `9.2 KB` | |
37 | | -| [**5.0.0**](#500-2021-03-10) | March 2021 | `9.3 KB` | |
38 | | -| [3.5.1](#351-2021-03-02) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | March 2021 | `-` | |
39 | | -| [4.1.2](#412-2021-02-25) | February 2021 | `9.2 KB` | |
40 | | -| [4.1.1](#411-2021-02-02) | February 2021 | `9.1 KB` | |
41 | | -| [4.1.0](#410-2021-01-14) | January 2021 | `9.1 KB` | |
| 3 | +| Version | Release date | `ws` version | Bundle size (UMD min+gzip) | |
| 4 | +|-------------------------------------------------------------------------------------------------------------|----------------|--------------|----------------------------| |
| 5 | +| [6.6.5](#665-2026-05-20) | May 2026 | `~8.20.1` | `8.7 KB` | |
| 6 | +| [6.6.4](#664-2025-12-23) | December 2025 | `~8.18.3` | `8.7 KB` | |
| 7 | +| [6.6.3](#663-2025-01-23) | January 2025 | `"` | `8.7 KB` | |
| 8 | +| [6.6.2](#662-2024-10-23) | October 2024 | `"` | `8.7 KB` | |
| 9 | +| [6.6.1](#661-2024-09-21) | September 2024 | `"` | `8.7 KB` | |
| 10 | +| [6.6.0](#660-2024-06-21) | June 2024 | `~8.17.1` | `8.6 KB` | |
| 11 | +| [6.5.4](#654-2024-06-18) (from the [6.5.x](https://github.com/socketio/engine.io-client/tree/6.5.x) branch) | June 2024 | `~8.17.1` | `8.8 KB` | |
| 12 | +| [3.5.4](#354-2024-06-18) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | June 2024 | `~7.5.10` | `-` | |
| 13 | +| [6.5.3](#653-2023-11-09) | November 2023 | `"` | `8.8 KB` | |
| 14 | +| [6.5.2](#652-2023-08-01) | August 2023 | `"` | `8.8 KB` | |
| 15 | +| [6.5.1](#651-2023-06-28) | June 2023 | `"` | `8.4 KB` | |
| 16 | +| [6.5.0](#650-2023-06-16) | June 2023 | `"` | `7.8 KB` | |
| 17 | +| [6.4.0](#640-2023-02-06) | February 2023 | `"` | `7.8 KB` | |
| 18 | +| [6.3.1](#631-2023-02-04) | February 2023 | `"` | `7.8 KB` | |
| 19 | +| [6.3.0](#630-2023-01-10) | January 2023 | `~8.11.0` | `8.0 KB` | |
| 20 | +| [6.2.3](#623-2022-10-13) | October 2022 | `"` | `7.8 KB` | |
| 21 | +| [3.5.3](#353-2022-09-07) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | September 2022 | `~7.4.2` | `-` | |
| 22 | +| [6.2.2](#622-2022-05-02) | May 2022 | `"` | `7.8 KB` | |
| 23 | +| [6.2.1](#621-2022-04-17) | April 2022 | `"` | `7.8 KB` | |
| 24 | +| [6.2.0](#620-2022-04-17) | April 2022 | `"` | `7.8 KB` | |
| 25 | +| [6.0.3](#603-2021-11-14) (from the [6.0.x](https://github.com/socketio/engine.io-client/tree/6.0.x) branch) | November 2021 | `"` | `7.4 KB` | |
| 26 | +| [6.1.1](#611-2021-11-14) | November 2021 | `"` | `7.4 KB` | |
| 27 | +| [6.1.0](#610-2021-11-08) | November 2021 | `"` | `7.4 KB` | |
| 28 | +| [6.0.2](#602-2021-10-15) | October 2021 | `"` | `7.4 KB` | |
| 29 | +| [6.0.1](#601-2021-10-14) | October 2021 | `"` | `7.4 KB` | |
| 30 | +| [**6.0.0**](#600-2021-10-08) | October 2021 | `~8.2.3` | `7.5 KB` | |
| 31 | +| [5.2.0](#520-2021-08-29) | August 2021 | `"` | `9.4 KB` | |
| 32 | +| [5.1.2](#512-2021-06-24) | June 2021 | `"` | `9.3 KB` | |
| 33 | +| [5.1.1](#511-2021-05-11) | May 2021 | `"` | `9.2 KB` | |
| 34 | +| [4.1.4](#414-2021-05-05) (from the [4.1.x](https://github.com/socketio/engine.io-client/tree/4.1.x) branch) | May 2021 | `"` | `9.1 KB` | |
| 35 | +| [3.5.2](#352-2021-05-05) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | May 2021 | `"` | `-` | |
| 36 | +| [5.1.0](#510-2021-05-04) | May 2021 | `"` | `9.2 KB` | |
| 37 | +| [5.0.1](#501-2021-03-31) | March 2021 | `"` | `9.2 KB` | |
| 38 | +| [**5.0.0**](#500-2021-03-10) | March 2021 | `"` | `9.3 KB` | |
| 39 | +| [3.5.1](#351-2021-03-02) (from the [3.5.x](https://github.com/socketio/engine.io-client/tree/3.5.x) branch) | March 2021 | `~6.1.0` | `-` | |
| 40 | +| [4.1.2](#412-2021-02-25) | February 2021 | `"` | `9.2 KB` | |
| 41 | +| [4.1.1](#411-2021-02-02) | February 2021 | `"` | `9.1 KB` | |
| 42 | +| [4.1.0](#410-2021-01-14) | January 2021 | `~7.4.2` | `9.1 KB` | |
| 43 | + |
| 44 | + |
| 45 | +## [6.6.5](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.4...engine.io-client@6.6.5) (2026-05-20) |
| 46 | + |
| 47 | +The `ws` dependency was bumped to `~8.20.1` following [CVE-2026-45736](https://github.com/advisories/GHSA-58qx-3vcg-4xpx). |
| 48 | + |
| 49 | +Note from the `ws` maintainers: |
| 50 | + |
| 51 | +> Although the calculated CVSS severity is medium, the actual severity is believed to be low, as the flaw is only exploitable through misuse that is unlikely in practice. |
| 52 | +
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| 53 | + |
| 54 | +### Dependencies |
| 55 | + |
| 56 | +- [`ws@~8.20.1`](https://github.com/websockets/ws/releases/tag/8.20.1) ([diff](https://github.com/websockets/ws/compare/8.18.3...8.20.1)) |
42 | 57 |
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43 | 58 |
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44 | 59 | ## [6.6.4](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.3...engine.io-client@6.6.4) (2025-12-23) |
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