jupyterlab 4.5.0rc1

v4.5.0rc1

on Python PyPI

4.5.0rc1

(Full Changelog)

Bugs fixed

• Update lumino to v2025.11.13 #18108 (@krassowski)
• Use IntersectionObserver to disable containment for on-screen cells #18091 (@Meriem-BenIsmail)
• Fix layout trashing when navigating notebook cell-by-cell #18080 (@krassowski)
• Hide “Paused in Debugger” overlay when session terminates #18067 (@arjxn-py)
• Debugger: Fix breakpoints lost when closing modules #18063 (@HaudinFlorence)

Maintenance and upkeep improvements

• Make usage2 server startup/teardown test more robust #18087 (@krassowski)
• Separate verdaccio install and startup to fix flaky release_test CI job #18082 (@krassowski)

Documentation improvements

• Clean up references to Gitpod #18107 (@jtpio)
• Update example for disabling buildAvailable #18075 (@Frank-Steiner)
• Update announcement from JupyterCon to JupyterLab 4.5.0 RC #18074 (@krassowski)
• Mention JupyterLab 4.5.0 RC in the installation instructions #18061 (@krassowski)
• Add plausible and logos to API docs #18059 (@krassowski)
• Convert documentation to Markdown #18044 (@jtpio)

Contributors to this release

(GitHub contributors page for this release)

@arjxn-py | @Frank-Steiner | @HaudinFlorence | @jasongrout | @jtpio | @jupyterlab-probot | @krassowski | @martinRenou | @Meriem-BenIsmail