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New features added

Added kernel_protocol_version to kernelspec #1483 (@JohanMabille, @ianthomas23)
Replaced PUB socket with XPUB socket #1482 (@JohanMabille, @SylvainCorlay, @ccordoba12, @ianthomas23, @minrk)

Enhancements made

Made IOPubThread constructor backward compatible #1492 (@JohanMabille, @SylvainCorlay, @ianthomas23, @minrk)
Advertises kernel protocol 5.5 #1488 (@JohanMabille, @ianthomas23)
Upgrade to jupyter_client 8.8.0 #1487 (@JohanMabille, @ianthomas23)
Implement kernel-side callstack filtering for internal frames #1481 (@arjxn-py, @JohanMabille, @ianthomas23)

Bugs fixed

add close event for wx timer app in loop_wx #1478 (@newville, @ianthomas23)

Maintenance and upkeep improvements

Temporarily revert "Test changing base method to async after (#1464)" #1493 (@ianthomas23, @JohanMabille)
Update pytest requirement from <9,>=7.0 to >=7.0,<10 in the actions group across 1 directory #1489 (@JohanMabille)
Removed spyder downstream tests #1486 (@JohanMabille, @ianthomas23)
Bump scientific-python/upload-nightly-action from 0.6.2 to 0.6.3 in the actions group #1484 (@JohanMabille)
Fix linting errors #1480 (@ianthomas23)
Bump actions/checkout from 5 to 6 in the actions group #1479 (@ianthomas23)
chore: update pre-commit hooks #1472 (@ianthomas23)
chore: update pre-commit hooks #1467 (@JohanMabille)
Test changing base method to async after #1295 #1464 (@Carreau, @ianthomas23)

Contributors to this release

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

`v7.1.0`

IPykernel 7.1.0 fixes an issue where display outputs such as Matplotlib plots were not included when using %notebook magic to save sessions as .ipynb files (#1435). This is enabled using the traitlet ZMQDisplayPublisher.store_display_history which defaults to the previous behaviour of False. This is a minor release rather than a patch release due to the addition of the new traitlet.

Output from threads is restored to the pre-6.29 behavior by default (route to latest cell, unless get_ipython().set_parent() is called explicitly from the thread. If it is called, output from that thread will continue to be routed to the same cell). This behavior is now opt-in, instead of unconditional (#1451).

This release also fixes bugs that were introduced into the 7.x branch relating to Matplotlib plots in separate windows not being displayed correctly (#1458), kernels launched in new threads failing asserts (#1455), and ContextVars persisting between cells (#1462). There is also a fix for keyboard interrupts on Windows (#1434).

Enhancements made

Store display outputs in history for %notebook magic #1435 (@Darshan808)

Bugs fixed

fix ContextVar persistence across cells #1462 (@minrk)
Fix matplotlib eventloops #1458 (@ianthomas23)
Refer to kernel launching thread instead of assuming the main thread #1455 (@dfalbel)
Fix routing of background thread output when no parent is set explicitly #1451 (@minrk)
Fix KeyboardInterrupt on Windows by manually resetting interrupt event #1434 (@ptosco)

Maintenance and upkeep improvements

update pre-commit and related #1465 (@Carreau)
test that matplotlib event loop integration is responsive #1463 (@minrk)
update tests for 3.14 #1453 (@minrk)

Contributors to this release

`v7.0.1`

IPykernel 7.0.1 is a bug fix release to support CPython 3.14.

Bugs fixed

Avoid overriding Thread._context in Python 3.14 #1447 (@ianthomas23)

Maintenance and upkeep improvements

Fix 7.x license warnings #1448 (@bollwyvl)
ci: Test on PyPy 3.11 instead of 3.10 #1444 (@cclauss)

Documentation improvements

Clean up changelog following 7.0.0 release #1439 (@ianthomas23)

Contributors to this release

@bollwyvl | @Carreau | @cclauss | @ianthomas23

`v7.0.0`

IPykernel 7.0.0 is a major release containing experimental support for kernel subshells.

If not using subshells it is intended to be backward compatible with the 6.x branch, but there are some architectural changes which may break assumptions made in downstream libraries and hence this is identified as a major releases as it is potentially backwards incompatible. If you experience problems then please report them, and you can pin ipykernel < 7 if necessary.

For further information and to report problems please see ipykernel 7.0.0 release with subshells (issue 1438).

Enhancements made

Use asyncio.Lock around subshell message handling #1430 (@ianthomas23)
Subshells implemented using tornado event loops on 6.x branch #1396 (@ianthomas23)

Bugs fixed

Forward port from 6.x: Correct use of asyncio.Lock to process a single control message at a time #1418 (@ianthomas23)
Cache separate headers on subshell threads #1414 (@ianthomas23)

Maintenance and upkeep improvements

Drop support for Python 3.9 #1431 (@ianthomas23)
Bump the actions group across 1 directory with 2 updates #1428 (@dependabot)
Continue to support Kernel._parent_ident for backward compatibility #1427 (@ianthomas23)
Reinstate ipyparallel downstream tests #1426 (@ianthomas23)
Reinstate jupyter_client downstream tests with exclusions #1425 (@ianthomas23)
Tests: Add robust tests for silent flag in subshells #1424 (@pankaj-bind)
Use correct __version__ on main branch after branch manipulations #1419 (@ianthomas23)
Remove links in changelog to github milestones that no longer exist #1415 (@ianthomas23)
Replace @flaky.flaky decorate with pytest fixture #1411 (@mgorny)
chore: update pre-commit hooks #1409 (@pre-commit-ci)
Bump scientific-python/upload-nightly-action from 0.6.1 to 0.6.2 in the actions group #1404 (@dependabot)
Backports from anyio (old main) branch to main branch #1402 (@ianthomas23)
Update pre-commit and github actions #1401 (@ianthomas23)
Test more python versions on 6.x branch #1398 (@davidbrochart)

Documentation improvements

Forward port of 6.x changelog to main branch #1429 (@ianthomas23)
Add subshell docstrings #1405 (@ianthomas23)

Contributors to this release

`v6.31.0`

6.31.0

IPykernel 6.31.0 fixes an issue where display outputs such as Matplotlib plots were not included when using %notebook magic to save sessions as .ipynb files. This is enabled using the traitlet ZMQDisplayPublisher.store_display_history which defaults to the previous behaviour of False. This is a minor release rather than a patch release due to the addition of the new traitlet.

Enhancements made

Backport PR #1435: Store display outputs in history for %notebook magic #1461 (@Darshan808)

Maintenance and upkeep improvements

Backport PR #1453: update tests for 3.14 #1460 (@minrk)
Backport PR #1444: Test on PyPy 3.11 instead of 3.10 #1459 (@cclauss)
6.x: Update PEP-639 license values in pyproject.toml #1446 (@bollwyvl)
Backport PR #1411: Replace @flaky.flaky decorate with pytest fixture #1421 (@mgorny)

Contributors to this release

`v6.30.1`

This is a bugfix release to fix a significant bug introduced in 6.30.0 that allowed control messages to be handled concurrently rather than sequentially which broke debugging in JupyterLab and VSCode.

Bugs fixed

Correct use of asyncio.Lock to process a single control message at a time #1416 (@ianthomas23)

Maintenance and upkeep improvements

Backport: Remove links in changelog to github milestones that no longer exist #1417 (@ianthomas23)

Contributors to this release

@ianthomas23

`v6.30.0`

This release fixes three bugs but is primarily a maintenance release bringing support for Python 3.13 and updating dependencies. It does not include subshells which will be in the upcoming 7.0.0 release. Users and downstream libraries that wish to avoid subshells should pin to ipykernel < 7.

Enhancements made

Remove control queue #1210 (@ianthomas23)

Bugs fixed

Set shell idle when message skipped by "should_handle" in "dispatch_shell" #1395 (@dby-tmwctw)
Fixed error accessing sys.stdout/sys.stderr when those are None #1247 (@gregory-shklover)
Allow datetime or str in test_sequential_control_messages #1219 (@ianthomas23)

Maintenance and upkeep improvements

6.x backports #1406 (@ianthomas23)
Update pre-commit and github actions #1401 (@ianthomas23)
Test more python versions on 6.x branch #1398 (@davidbrochart)
Backports and extra changes to fix CI on 6.x branch #1390 (@ianthomas23)
Remove nose import. #1368 (@Carreau)
Test more python versions #1358 (@davidbrochart)
Fix expected text depending on IPython version. #1354 (@Carreau)
Licence :: * trove classifiers are deprecated #1348 (@Carreau)
Try to fix spyder kernel install #1337 (@Carreau)
Remove test_check job #1335 (@Carreau)
Don't rerun test with --lf it hides failures. #1324 (@Carreau)
Remove link to numfocus for funding. #1320 (@Carreau)
Remove downstream_check #1318 (@Carreau)
Copy payloadpage.page from IPython #1317 (@Carreau)
Remove base setup #1299 (@davidbrochart)
Rely on intrsphinx_registry to keep intersphinx up to date. #1290 (@Carreau)
Drop support for Python 3.8 #1284 (@ianthomas23)
Start testing on 3.13 #1277 (@Carreau)
Build docs on ubuntu #1257 (@blink1073)
Avoid a DeprecationWarning on Python 3.13+ #1248 (@hroncok)
Catch IPython 8.24 DeprecationWarnings #1242 (@s-t-e-v-e-n-k)
Add compat with pytest 8 #1231 (@blink1073)
Set all min deps #1229 (@blink1073)

Contributors to this release

`v6.29.5`

Bugs fixed

Fix use of "%matplotlib osx" #1237 (@ianthomas23)

Maintenance and upkeep improvements

[6.x] Update Release Scripts #1251 (@blink1073)

Contributors to this release

@blink1073 | @ianthomas23

`v6.29.4`

Bugs fixed

Fix side effect import for pickleutil #1216 (@blink1073)

Maintenance and upkeep improvements

Do not import debugger/debugpy unless needed #1223 (@krassowski)

Contributors to this release

@agronholm | @blink1073 | @davidbrochart | @krassowski | @minrk

`v6.29.3`

Enhancements made

Eventloop scheduling improvements for stop_on_error_timeout and schedule_next #1212 (@jdranczewski)

Bugs fixed

Disable frozen modules by default, add a toggle #1213 (@krassowski)

Maintenance and upkeep improvements

Fix typings and update project urls #1214 (@blink1073)
Unpin pytest-asyncio and update ruff config #1209 (@blink1073)

Documentation improvements

Correct spelling mistake #1208 (@joouha)

Contributors to this release

@blink1073 | @ccordoba12 | @jdranczewski | @joouha | @krassowski

`v6.29.2`

Bugs fixed

Fix: ipykernel_launcher, delete absolute sys.path[0] #1206 (@stdll00)

Maintenance and upkeep improvements

Re-enable skipped debugger test #1207 (@ianthomas23)

Contributors to this release

@ianthomas23 | @stdll00

`v6.29.1`

Bugs fixed

fix: on exception, return a 0, so that the "sum" still computes #1204 (@petervandenabeele)
Fix handling of "silent" in execute request #1200 (@Haadem)

Maintenance and upkeep improvements

chore: update pre-commit hooks #1205 (@pre-commit-ci)
Do git ignore of /node_modules/.cache #1203 (@petervandenabeele)
Bump the actions group with 1 update #1201 (@dependabot)

Contributors to this release

@dependabot | @Haadem | @petervandenabeele | @pre-commit-ci

`v6.29.0`

Enhancements made

Always set debugger to true in kernelspec #1191 (@ianthomas23)

Bugs fixed

Revert "Enable ProactorEventLoop on windows for ipykernel" #1194 (@blink1073)
Make outputs go to correct cell when generated in threads/asyncio #1186 (@krassowski)

Maintenance and upkeep improvements

Pin pytest-asyncio to 0.23.2 #1189 (@ianthomas23)
chore: update pre-commit hooks #1187 (@pre-commit-ci)

Contributors to this release

@blink1073 | @ianthomas23 | @krassowski | @pre-commit-ci

`v6.28.0`