4.6.0a0

(Full Changelog)

New features added

• feat(completer): Add syntax highlighting for ghost text #18073 (@MUFFANUJ, @Darshan808, @jtpio, @krassowski)

Deprecated features

• Drives: Deprecate the notion of defaultContentProvider #18169 (@martinRenou, @brichet, @jasongrout, @jtpio, @krassowski)

Enhancements made

• Add a "Stop Debugger" button to the paused overlay #18184 (@arjxn-py, @jtpio, @krassowski, @martinRenou)
• Detect and log slow plugins #18181 (@Darshan808, @jtpio, @krassowski)
• Add the 'jupyterlab' entry point #18158 (@brichet, @jasongrout, @jtpio)
• Add a setting to show file filter bar by default #18104 (@MUFFANUJ, @Darshan808, @krassowski)
• Move Kernel Sources filter bar to toolbar and enable live filtering #18079 (@arjxn-py, @jtpio, @krassowski, @martinRenou)
• Improve the error message provided when jupyterhub is missing #18060 (@frenzymadness, @Darshan808, @hroncok, @krassowski)

Bugs fixed

• Fix search icon styling in command palette #18202 (@Meriem-BenIsmail, @jtpio, @krassowski)
• Fix scrollPastEnd for text editors #18186 (@Meriem-BenIsmail, @krassowski)
• Restore focus after closing the command palette #18167 (@Meriem-BenIsmail, @jasongrout, @krassowski)
• Enable undo/redo in JSON settings editor #18165 (@Meriem-BenIsmail, @krassowski)
• Fix: Safely handle missing args in fileeditor:change-font-size label provider #18157 (@prajyot-porje, @Darshan808, @krassowski)
• Show rename dialog for new files moved before saving #18145 (@anafontan, @Darshan808, @ZhYGuoL, @jtpio)
• Fix Notebook Debugger: Missing Current-Line Highlight #18140 (@arjxn-py, @RRosio, @martinRenou)
• Debugger: Handle the case for editor being null #18124 (@martinRenou, @krassowski)
• ToolbarButtonComponent and CommandToolbarButtonComponent: add AriaMenuButtonProps to allow ARIA menu-button attributes #18118 (@agriyakhetarpal, @krassowski)
• Debugger: Fix restart and debug command. #18115 (@HaudinFlorence, @RRosio, @brichet, @krassowski, @martinRenou)
• Respect the activate option when opening document widgets #18114 (@brichet, @krassowski)
• Restore auto-resizing of the code console input prompts #17819 (@jtpio, @Darshan808, @agriyakhetarpal, @krassowski)
• Fix inconsistent state updates of toolbar buttons #17230 (@MUFFANUJ, @krassowski)

Maintenance and upkeep improvements

• Check if the list of commands, tokens and plugins has changed #18198 (@jtpio, @krassowski)
• Revert "Add the 'jupyterlab' entry point" #18166 (@jtpio, @jasongrout)
• Update to Playwright 1.57.0 #18151 (@jtpio, @krassowski)
• Prevent some supply-chain attack vectors #18142 (@jasongrout, @krassowski, @mfisher87)
• Switch from webpack to rspack for bundling #16005 (@jtpio, @FoSuCloud, @chenjiahan, @erkin98, @jasongrout, @krassowski, @xc2)

Documentation improvements

• Update announcement and installation instructions post 4.5.0 final release #18125 (@krassowski, @jtpio, @ktaletsk)
• Clean up old references to restructured text #18123 (@jtpio, @krassowski)
• Add plotting and visualization documentation #18094 (@MMesch, @Darshan808, @krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@agriyakhetarpal (activity) | @anafontan (activity) | @arjxn-py (activity) | @brichet (activity) | @chenjiahan (activity) | @Darshan808 (activity) | @erkin98 (activity) | @FoSuCloud (activity) | @frenzymadness (activity) | @HaudinFlorence (activity) | @hroncok (activity) | @ianthomas23 ([activity](https://github.com/search?q=repo%3Ajupyterlab%2Fjupyterlab+in...

4.5.1

(Full Changelog)

Deprecated features

• Drives: Deprecate the notion of defaultContentProvider #18169 (@martinRenou)

Enhancements made

• Detect and log slow plugins #18181 (@Darshan808)

Bugs fixed

• Debugger: Fix restart and debug command. #18115 (@HaudinFlorence)
• Fix scrollPastEnd for text editors #18186 (@Meriem-BenIsmail)
• Enable undo/redo in JSON settings editor #18165 (@Meriem-BenIsmail)
• Restore focus after closing the command palette #18167 (@Meriem-BenIsmail)
• Restore auto-resizing of the code console input prompts #17819 (@jtpio)
• Fix: Safely handle missing args in fileeditor:change-font-size label provider #18157 (@prajyot-porje)

Maintenance and upkeep improvements

• Check if the list of commands, tokens and plugins has changed #18198 (@jtpio)
• Update to Playwright 1.57.0 #18151 (@jtpio)
• Reconfigure 4.5.x branch #18161 (@jtpio, @jasongrout, @krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@Darshan808 (activity) | @FoSuCloud (activity) | @HaudinFlorence (activity) | @ianthomas23 (activity) | @jasongrout (activity) | @jtpio (activity) | @krassowski (activity) | @martinRenou (activity) | @meeseeksmachine (activity) | @Meriem-BenIsmail (activity) | @prajyot-porje (activity) | @xc2 (activity)

4.5.0

(Full Changelog)

New features added

• Add terminal search functionality #17691 (@ianthomas23)

Enhancements made

• Fix kernel status display in status bar #18047 (@Darshan808)
• Introduce DebuggerDisplayRegistry to provide context-aware display names for debugger panels #18043 (@arjxn-py)
• Introduce new token for the default IContentProvider #18027 (@martinRenou)
• Update Show more outputs button design #18021 (@andrii-i)
• Optimize content-visibility application #18013 (@Meriem-BenIsmail)
• Show execution count in breakpoints, callstack, and sources panels while debugging in console #18003 (@arjxn-py)
• Keep debugger state though kernel restarts #17972 (@gjmooney)
• Make DocumentManager dialogs customizable #17961 (@Darshan808)
• Systematise how base URL is obtained to allow swapping it more easily #17952 (@krassowski)
• Export the ContentProviderRegistry #17940 (@martinRenou)
• Make filebrowser breadcrumbs configurable #17932 (@Darshan808)
• Switch the default windowing mode to contentVisibility #17926 (@Meriem-BenIsmail)
• Pass context down in attachments resolver #17924 (@krassowski)
• Allow swapping the empty markdown cell placeholder (and translate it) #17920 (@krassowski)
• Enable the minimap for all windowing modes #17904 (@Meriem-BenIsmail)
• Debugger: Differentiate selected breakpoints with specific style #17893 (@HaudinFlorence)
• Use console for debugger evaluation #17892 (@gjmooney)
• Debugger: Visual indicator when debugger is paused #17891 (@arjxn-py)
• Add IUserAPIClient to make swapping UserManager easier #17884 (@krassowski)
• Provide context about the tag and attribute to the URL resolver #17882 (@krassowski)
• Debugger: Show cell execution count in breakpoint/call stack/source panel #17881 (@arjxn-py)
• Add file browser menu for creating new Python/R/Julia files #17848 (@martinRenou)
• Allow configuring toSkip for the SettingsEditor #17834 (@jtpio)
• Use content-visibility to render notebook cells more efficiently #17822 (@Meriem-BenIsmail)
• Use toolbar registry for log console #17814 (@gjmooney)
• Add a new addExtraLineOnCellMerge setting #17806 (@jtpio)
• Update to mermaid 11.10, marked 16.2 #17800 (@bollwyvl)
• Allow opening notebooks without starting a kernel #17798 (@jtpio)
• Allow to swap the URL resolver #17784 (@krassowski)
• Add the "Show Workspace Indicator" command to the palette #17780 (@jtpio)
• Auto-switch between light and dark mode when "Synchronize with System Settings" is enabled #17733 (@MUFFANUJ)
• Keep cell id when the user changes cell type #17731 (@afshin)
• Discover the app directory relative to the installed module #17721 (@zanieb)
• Show checkbox and buttons of Dialog component on separate lines #17696 (@MUFFANUJ)
• Add types for interrupt messages, and move them from shell to control channel #17684 (@krassowski)
• Add fold/unfold commands to menu and command palette #17677 (@Darshan808)
• Add a new allowFileUploads setting to the file browser #17676 (@jtpio)
• Dockerfile: Install less, vim, and nano #17670 (@rschroll)
• Describe args for all commands #17649 (@jtpio)
• Add audio-extension and video-extension #17636 (@jtpio)
• Add select all command for file browser listing #17571 (@RRosio)
• Add a selectionChanged signal to the file browser #17563 (@jtpio)
• Auto-open uploaded files with size and settings control #17556 (@Darshan808)
• Add a setting to configure the default log level for the Log Console #17547 (@jtpio)
• Add a signal when cells are pasted in the Notebook #17506 (@brichet)
• Add new CSS rule for expanding linked output to 100% height #17487 (@SylvainCorlay)
• Add an optional exportAs method to NbConvert.IManager #17482 (@jtpio)
• Reorder extra_labextensions_path to favor defaults #17476 (@peytondmurray)
• Use the system clipboard for copying and pasting cells #17445 (@yacchin1205)
• Add jump to executing/executed cell button #16880 (@Darshan808)

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)
• Fix allow-same-origin exception handling in sandbox when changing trust status #18049 (@skapin)
• Don't open default editor if a different kind of editor is already open #18034 (@robertstrauss)
• Fix debugger initialization for notebooks on reload #18028 (@arjxn-py)
• Only show hidden part of the path in the tooltip of ellipsis [#18026](https://github.com/jupyterlab/jupyterlab/pull...

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

4.5.0rc0

(Full Changelog)

Enhancements made

• Fix kernel status display in status bar #18047 (@Darshan808)
• Introduce DebuggerDisplayRegistry to provide context-aware display names for debugger panels #18043 (@arjxn-py)
• Introduce new token for the default IContentProvider #18027 (@martinRenou)
• Update Show more outputs button design #18021 (@andrii-i)
• Optimize content-visibility application #18013 (@Meriem-BenIsmail)
• Keep debugger state though kernel restarts #17972 (@gjmooney)
• Add jump to executing/executed cell button #16880 (@Darshan808)

Bugs fixed

• Fix allow-same-origin exception handling in sandbox when changing trust status #18049 (@skapin)
• Don't open default editor if a different kind of editor is already open #18034 (@robertstrauss)
• Fix debugger initialization for notebooks on reload #18028 (@arjxn-py)
• Only show hidden part of the path in the tooltip of ellipsis #18026 (@krassowski)
• Fix ObservableList.removeValue behaviour: if item isn't found, don't just remove the last item! #18019 (@robertstrauss)
• Fix breadcrumb drag-and-drop issues #18014 (@Darshan808)
• Make file browser optional in file editor extension #17922 (@Ankitaupadhaya)
• Fix kernel status display in status bar #17894 (@Darshan808)

Maintenance and upkeep improvements

• Update PyPI Downloads badge in README.md #18052 (@jtpio)
• Update to mermaid 11.12.1 #18046 (@bollwyvl)
• Revert "Fix kernel status display in status bar" #18038 (@krassowski)
• Fix flaky test Drag file from nested directory to parent via breadcrumb #18015 (@Darshan808)

Documentation improvements

• Update PyPI Downloads badge in README.md #18052 (@jtpio)
• Add plausible.io stats to the jupyterlab docs #18041 (@jasongrout)
• Document how to disable the file uploads via the settings #18040 (@jtpio)
• Fix changelog URLs #18031 (@krassowski)
• User-facing changelog for JupyterLab 4.5 #17967 (@RRosio)

Contributors to this release

(GitHub contributors page for this release)

@andrii-i | @Ankitaupadhaya | @arjxn-py | @bollwyvl | @Darshan808 | @domoritz | @ellisonbg | @gjmooney | @jasongrout | @jtpio | @jupyterlab-probot | @krassowski | @martinRenou | @Meriem-BenIsmail | @robertstrauss | @RRosio | @skapin

4.4.10

(Full Changelog)

Bugs fixed

• Fix ObservableList.removeValue behaviour: if item isn't found, don't just remove the last item! #18019 (@robertstrauss)
• Fix highlighting search on output cells and previous match skips #17797 (@itsmevichu)
• Fix spurious scrollbar in output area due to prompt overlay #17981 (@shreve)
• Fix race condition renaming unnamed files on first save #17982 (@shreve)
• Fix empty whitespace after large cell rendering #17949 (@Meriem-BenIsmail)

Maintenance and upkeep improvements

• Bandaid: pin ipykernel on CI to pre-7.0 #17992 (@krassowski)
• Fix examples on 4.4.x #17963 (@krassowski)
• Temporarily pin ipykernel to avoid CI breakage with 7.0 pre-release #17957 (@arjxn-py)

Documentation improvements

• Update JupyterCon 2025 announcement links #17983 (@krassowski)
• Add cross-references to API reference, fix missing packages in API #17953 (@krassowski)
• Fix parameter documentation issues in API reference #17954 (@krassowski)

Contributors to this release

(GitHub contributors page for this release)

@andrii-i | @arjxn-py | @Darshan808 | @github-actions | @hxrshxz | @jtpio | @jupyterlab-probot | @krassowski | @lumberbot-app | @martinRenou | @meeseeksmachine

4.5.0b1

(Full Changelog)

Enhancements made

• Show execution count in breakpoints, callstack, and sources panels while debugging in console #18003 (@arjxn-py)
• Make DocumentManager dialogs customizable #17961 (@Darshan808)
• Systematise how base URL is obtained to allow swapping it more easily #17952 (@krassowski)
• Export the ContentProviderRegistry #17940 (@martinRenou)
• Make filebrowser breadcrumbs configurable #17932 (@Darshan808)
• Debugger: Visual indicator when debugger is paused #17891 (@arjxn-py)
• Debugger: Show cell execution count in breakpoint/call stack/source panel #17881 (@arjxn-py)

Bugs fixed

• Fix race condition renaming unnamed files on first save #17982 (@shreve)
• Fix spurious scrollbar in output area due to prompt overlay #17981 (@shreve)
• Fix file drag-and-drop to breadcrumbs #17975 (@Darshan808)
• Delay content-visibility application to handle early CodeMirror initialization (Firefox) #17973 (@Meriem-BenIsmail)
• Prevent widget closure when Save As is cancelled #17956 (@Darshan808)
• Fix empty whitespace after large cell rendering #17949 (@Meriem-BenIsmail)
• Fix highlighting search on output cells and previous match skips #17797 (@itsmevichu)

Maintenance and upkeep improvements

• Bandaid: pin ipykernel on CI to pre-7.0 #17992 (@krassowski)
• Add UI testing on Firefox (ignore snapshot differences) #17965 (@krassowski)
• Update to Playwright 1.56.0 #17960 (@jtpio)
• Temporarily pin ipykernel to avoid CI breakage with 7.0 pre-release #17957 (@arjxn-py)
• Fix case of 'Debugger console' to 'Debugger Console' #17939 (@jtpio)
• Improve robustness of inline-completer UI tests #17931 (@ianthomas23)

Documentation improvements

• Update JupyterCon 2025 announcement links #17983 (@krassowski)
• Make DocumentManager dialogs customizable #17961 (@Darshan808)
• Fix parameter documentation issues in API reference #17954 (@krassowski)
• Add cross-references to API reference, fix missing packages in API #17953 (@krassowski)
• Systematise how base URL is obtained to allow swapping it more easily #17952 (@krassowski)

Contributors to this release

(GitHub contributors page for this release)

@andrii-i | @arjxn-py | @Darshan808 | @github-actions | @hxrshxz | @ianthomas23 | @itsmevichu | @jtpio | @jupyterlab-probot | @krassowski | @lumberbot-app | @martinRenou | @Meriem-BenIsmail | @shreve

4.5.0b0

(Full Changelog)

Enhancements made

• Switch the default windowing mode to contentVisibility #17926 (@Meriem-BenIsmail)
• Pass context down in attachments resolver #17924 (@krassowski)
• Allow swapping the empty markdown cell placeholder (and translate it) #17920 (@krassowski)
• Enable the minimap for all windowing modes #17904 (@Meriem-BenIsmail)
• Debugger: Differentiate selected breakpoints with specific style #17893 (@HaudinFlorence)
• Use console for debugger evaluation #17892 (@gjmooney)

Bugs fixed

• Fix scrolling to targets within notebook #17928 (@krassowski)
• Debugger: fix adding a breakpoint on an empty line of code and reclicking after addition #17923 (@HaudinFlorence)
• Debugger: Only send the configurationDone message once as per the DAP #17912 (@martinRenou)
• Correctly dispose TerminalManager even if terminals are not available #17876 (@krassowski)

Maintenance and upkeep improvements

• Make debugger console tests more robust and faster #17937 (@krassowski)
• Fix integrity checks on CI #17927 (@krassowski)
• Ignore npmjs.com in check-links #17915 (@jtpio)
• Update to Playwright 1.55.1 #17914 (@jtpio)

Contributors to this release

(GitHub contributors page for this release)

@github-actions | @gjmooney | @HaudinFlorence | @jtpio | @jupyterlab-probot | @krassowski | @martinRenou | @Meriem-BenIsmail

4.4.9

(Full Changelog)

Bugs fixed

• Correctly dispose TerminalManager even if terminals are not available #17876 (@krassowski)
• Fix scrolling to targets within notebook #17928 (@krassowski)

Contributors to this release

(GitHub contributors page for this release)

@jupyterlab-probot | @krassowski | @martinRenou | @meeseeksmachine

4.4.8

(Full Changelog)

Bugs fixed

• Debugger: Only send the configurationDone message once as per the DAP #17912 (@martinRenou)
• Fix output prompt overlay height for large outputs #17863 (@Meriem-BenIsmail)
• Prevent overlay of content from other columns when renaming a file in the file browser #17857 (@CrafterKolyan)
• Fix notebook toolbar item order #17866 (@Darshan808)

Maintenance and upkeep improvements

• Ignore npmjs.com in check-links #17915 (@jtpio)

Documentation improvements

• Add JupyterCon banner and Jupyter colors #17906 (@choldgraf)

Contributors to this release

(GitHub contributors page for this release)

@brichet | @github-actions | @HaudinFlorence | @jtpio | @jupyterlab-probot | @krassowski | @martinRenou | @meeseeksmachine | @Meriem-BenIsmail | @williamstein