●Change8

Migrating to PyTorch Lightning 2.6.4

Version 2.6.4 introduces 1 breaking change. This guide details how to update your code.

Released: 5/20/2026

1
Breaking Changes
1
Migration Steps
8
Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

Neptune loggerLitLoggerval_check_intervallimit_val_batchesFSDPStrategydevice_meshRichModelSummarySimpleProfiler

Breaking Changes

●Issue #1

Support for Neptune logger has been removed. Users relying on this logger must migrate to an alternative solution, as the public service for Neptune is being sunsetted.

Migration Steps

  1. 1
    If you were using the Neptune logger, you must switch to a different logging integration as Neptune support has been removed.

Release Summary

This patch release removes deprecated Neptune logger support due to service sunsetting and includes several bug fixes related to FSDP mixed precision initialization, validation interval checks, and profiler precision.

Need More Details?

View the full release notes and all changes for PyTorch Lightning 2.6.4.

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