# Vue v3.5.40

- Product: Vue (https://whatsnew.fyi/product/vue-core)
- Vendor: Vue.js
- Date: 2026-07-16
- Version: v3.5.40
- Original notes: https://github.com/vuejs/core/releases/tag/v3.5.40
- Permalink: https://whatsnew.fyi/product/vue-core/releases/v3.5.40

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'.

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- **fixed** — avoid leaking slot branch keys in compiler-core
- **fixed** — pass namespace when patching dynamic props during hydration
- **fixed** — handle effect removal during scope stop in reactivity
- **fixed** — skip lazy hydration for detached roots in runtime-core
- **fixed** — unwind dangling blocks when slot content throws in runtime-core
- **fixed** — respect current select model type in runtime-dom
- **fixed** — handle errors in optimized component renders in server-renderer
- **fixed** — remove package dependency cycle in server-renderer
- **fixed** — prevent SSR comment escaping from creating closing delimiters in shared
- **fixed** — don't constrain component $el type to Element in types

###### Bug Fixes

* **compiler-core:** avoid leaking slot branch keys ([#15051](https://github.com/vuejs/core/issues/15051)) ([20c9d26](https://github.com/vuejs/core/commit/20c9d263d3bfafdfbcc1921f259fd8f711e18659)), closes [#15048](https://github.com/vuejs/core/issues/15048)
* **hydration:** pass namespace when patching dynamic props ([#15082](https://github.com/vuejs/core/issues/15082)) ([e0d2723](https://github.com/vuejs/core/commit/e0d27234ddd2061383cb5dcc475d6b9558ed8e4f)), closes [#15081](https://github.com/vuejs/core/issues/15081) [#15050](https://github.com/vuejs/core/issues/15050)
* **reactivity:** handle effect removal during scope stop ([#15084](https://github.com/vuejs/core/issues/15084)) ([378f978](https://github.com/vuejs/core/commit/378f9783248a4a4f20781d665d4f7089f39cae6e)), closes [#15083](https://github.com/vuejs/core/issues/15083)
* **runtime-core:** skip lazy hydration for detached roots ([#15092](https://github.com/vuejs/core/issues/15092)) ([97f3525](https://github.com/vuejs/core/commit/97f3525551ad06103083eb2cbf9858c5e57cd58e)), closes [#15091](https://github.com/vuejs/core/issues/15091)
* **runtime-core:** unwind dangling blocks when slot content throws ([#15071](https://github.com/vuejs/core/issues/15071)) ([ddc132d](https://github.com/vuejs/core/commit/ddc132d7c054ecd2029ddcc95bcba770cd44f022)), closes [#15070](https://github.com/vuejs/core/issues/15070)
* **runtime-dom:** respect current select model type ([#15010](https://github.com/vuejs/core/issues/15010)) ([eb89e93](https://github.com/vuejs/core/commit/eb89e935a771ab7fc3f8e67a82bc8fc7ea28bdaa)), closes [#15009](https://github.com/vuejs/core/issues/15009)
* **server-renderer:** handle errors in optimized component renders ([#12601](https://github.com/vuejs/core/issues/12601)) ([474907c](https://github.com/vuejs/core/commit/474907c0f01d021c564545137051a2b56eb4a769)), closes [#12575](https://github.com/vuejs/core/issues/12575)
* **server-renderer:** remove package dependency cycle ([#15063](https://github.com/vuejs/core/issues/15063)) ([4d35eca](https://github.com/vuejs/core/commit/4d35ecadb6f625b0f7407ccee0e357c2dd8084c7))
* **shared:** prevent SSR comment escaping from creating closing delimiters ([#15045](https://github.com/vuejs/core/issues/15045)) ([bd962bb](https://github.com/vuejs/core/commit/bd962bbaca746d8f65775a07723420406ebad0da))
* **types:** don't constrain component $el type to Element ([#15040](https://github.com/vuejs/core/issues/15040)) ([164460a](https://github.com/vuejs/core/commit/164460a52988c44dc34a541219c88120078372a0))