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Bumps [jupyterlab](https://github.com/jupyterlab/jupyterlab) from 4.5.7 to 4.5.9. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/jupyterlab/jupyterlab/releases">jupyterlab's releases</a>.</em></p> <blockquote> <h2>v4.5.9</h2> <h2>4.5.9</h2> <p>(<a href="https://github.com/jupyterlab/jupyterlab/compare/v4.5.8...26936727d7f197bab4f314ca50690cd162d50312">Full Changelog</a>)</p> <h3>Bugs fixed</h3> <ul> <li>Fix <code>jupyter labextension build</code> crash on <code>webpack ≥ 5.107</code> <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/19021">#19021</a> (<a href="https://github.com/Darshan808"><code>@Darshan808</code></a>, <a href="https://github.com/krassowski"><code>@krassowski</code></a>)</li> <li>Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18992">#18992</a>: Fix hidden cells after moving collapsed headings <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/19016">#19016</a> (<a href="https://github.com/MUFFANUJ"><code>@MUFFANUJ</code></a>, <a href="https://github.com/krassowski"><code>@krassowski</code></a>)</li> <li>Forbid relative URLs in extensionmanager <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/19013">#19013</a> (<a href="https://github.com/Yann-P"><code>@Yann-P</code></a>)</li> <li>Fix XSS in extension manager's <code>homepage_url</code> <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/19003">#19003</a> (<a href="https://github.com/Yann-P"><code>@Yann-P</code></a>)</li> <li>Fix toolbar popup row clipping in Safari <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18998">#18998</a> (<a href="https://github.com/arun-357"><code>@arun-357</code></a>)</li> </ul> <h3>Contributors to this release</h3> <p>The following people contributed discussions, new ideas, code and documentation contributions, and review. See <a href="https://github-activity.readthedocs.io/en/latest/use/#how-does-this-tool-define-contributions-in-the-reports">our definition of contributors</a>.</p> <p>(<a href="https://github.com/jupyterlab/jupyterlab/graphs/contributors?from=2026-06-04&to=2026-06-17&type=c">GitHub contributors page for this release</a>)</p> <p><a href="https://github.com/arun-357"><code>@arun-357</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3Aarun-357+updated%3A2026-06-04..2026-06-17&type=Issues">activity</a>) | <a href="https://github.com/Darshan808"><code>@Darshan808</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3ADarshan808+updated%3A2026-06-04..2026-06-17&type=Issues">activity</a>) | <a href="https://github.com/krassowski"><code>@krassowski</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3Akrassowski+updated%3A2026-06-04..2026-06-17&type=Issues">activity</a>) | <a href="https://github.com/MUFFANUJ"><code>@MUFFANUJ</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3AMUFFANUJ+updated%3A2026-06-04..2026-06-17&type=Issues">activity</a>) | <a href="https://github.com/Yann-P"><code>@Yann-P</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3AYann-P+updated%3A2026-06-04..2026-06-17&type=Issues">activity</a>)</p> <h2>v4.5.8</h2> <h2>4.5.8</h2> <p>(<a href="https://github.com/jupyterlab/jupyterlab/compare/v4.5.7...8d30d481fbab784096e04d85dfa3b0c36e77be2c">Full Changelog</a>)</p> <h3>Bugs fixed</h3> <ul> <li>Prevent dialog from hanging when <code>getValue()</code> throws <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18938">#18938</a> (<a href="https://github.com/AliMahmoudDev"><code>@AliMahmoudDev</code></a>)</li> <li>Add <code>packaging</code> min version pin <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18910">#18910</a> (<a href="https://github.com/krassowski"><code>@krassowski</code></a>)</li> <li>Use CSS <code>anchor</code> for prompt overlay <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18840">#18840</a> (<a href="https://github.com/CrafterKolyan"><code>@CrafterKolyan</code></a>)</li> </ul> <h3>Maintenance and upkeep improvements</h3> <ul> <li>Fix completer test failures on CI <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18946">#18946</a> (<a href="https://github.com/krassowski"><code>@krassowski</code></a>)</li> <li>Bump license webpack plugin <a href="https://redirect.github.com/jupyterlab/jupyterlab/pull/18929">#18929</a> (<a href="https://github.com/Darshan808"><code>@Darshan808</code></a>, <a href="https://github.com/krassowski"><code>@krassowski</code></a>)</li> </ul> <h3>Contributors to this release</h3> <p>The following people contributed discussions, new ideas, code and documentation contributions, and review. See <a href="https://github-activity.readthedocs.io/en/latest/use/#how-does-this-tool-define-contributions-in-the-reports">our definition of contributors</a>.</p> <p>(<a href="https://github.com/jupyterlab/jupyterlab/graphs/contributors?from=2026-04-29&to=2026-06-04&type=c">GitHub contributors page for this release</a>)</p> <p><a href="https://github.com/AliMahmoudDev"><code>@AliMahmoudDev</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3AAliMahmoudDev+updated%3A2026-04-29..2026-06-04&type=Issues">activity</a>) | <a href="https://github.com/CrafterKolyan"><code>@CrafterKolyan</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3ACrafterKolyan+updated%3A2026-04-29..2026-06-04&type=Issues">activity</a>) | <a href="https://github.com/Darshan808"><code>@Darshan808</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3ADarshan808+updated%3A2026-04-29..2026-06-04&type=Issues">activity</a>) | <a href="https://github.com/krassowski"><code>@krassowski</code></a> (<a href="https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+involves%3Akrassowski+updated%3A2026-04-29..2026-06-04&type=Issues">activity</a>)</p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="dd65403362"><code>dd65403</code></a> [ci skip] Publish 4.5.9</li> <li><a href="26936727d7"><code>2693672</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18992">#18992</a>: Fix hidden cells after moving collapsed headings (<a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/19016">#19016</a>)</li> <li><a href="360c1760b5"><code>360c176</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18998">#18998</a> on branch 4.5.x (Fix toolbar popup row clipping in Safari)...</li> <li><a href="e9db01011d"><code>e9db010</code></a> Fix <code>jupyter labextension build</code> crash on <code>webpack ≥ 5.107</code> (<a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/19021">#19021</a>)</li> <li><a href="3b8428c04e"><code>3b8428c</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/19013">#19013</a> on branch 4.5.x (Forbid relative URLs in extensionmanager)...</li> <li><a href="3c84a84cf4"><code>3c84a84</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/19003">#19003</a> on branch 4.5.x (Fix XSS in extension manager's `homepage_...</li> <li><a href="0dee9961fa"><code>0dee996</code></a> [ci skip] Publish 4.5.8</li> <li><a href="8d30d481fb"><code>8d30d48</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18946">#18946</a> on branch 4.5.x (Fix completer test failures on CI) (<a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18949">#18949</a>)</li> <li><a href="872d4c8449"><code>872d4c8</code></a> Backport PR <a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18938">#18938</a> on branch 4.5.x (Prevent dialog from hanging when `getValu...</li> <li><a href="d8a387498b"><code>d8a3874</code></a> Bump license webpack plugin (<a href="https://redirect.github.com/jupyterlab/jupyterlab/issues/18929">#18929</a>)</li> <li>Additional commits viewable in <a href="https://github.com/jupyterlab/jupyterlab/compare/@jupyterlab/lsp@4.5.7...@jupyterlab/lsp@4.5.9">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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🦜🍎️ LangChain Core
Looking for the JS/TS version? Check out LangChain.js.
To help you ship LangChain apps to production faster, check out LangSmith. LangSmith is a unified developer platform for building, testing, and monitoring LLM applications.
Quick Install
uv add langchain-core
🤔 What is this?
LangChain Core contains the base abstractions that power the LangChain ecosystem.
These abstractions are designed to be as modular and simple as possible.
The benefit of having these abstractions is that any provider can implement the required interface and then easily be used in the rest of the LangChain ecosystem.
⛰️ Why build on top of LangChain Core?
The LangChain ecosystem is built on top of langchain-core. Some of the benefits:
- Modularity: We've designed Core around abstractions that are independent of each other, and not tied to any specific model provider.
- Stability: We are committed to a stable versioning scheme, and will communicate any breaking changes with advance notice and version bumps.
- Battle-tested: Core components have the largest install base in the LLM ecosystem, and are used in production by many companies.
📖 Documentation
For full documentation, see the API reference. For conceptual guides, tutorials, and examples on using LangChain, see the LangChain Docs. You can also chat with the docs using Chat LangChain.
📕 Releases & Versioning
See our Releases and Versioning policies.
💁 Contributing
As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
For detailed information on how to contribute, see the Contributing Guide.
Resources
- LangChain Academy — comprehensive, free courses on LangChain libraries and products, made by the LangChain team
- Code of Conduct — community guidelines and standards