changelog

Author: SkafteNicki

src/lightning/pytorch/CHANGELOG.md

@@ -41,6 +41,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fix `save_last` behavior in the absence of validation ([#20960](https://github.com/Lightning-AI/pytorch-lightning/pull/20960))
 
 
+- Fix gradient calculation in `lr_finder` for `mode="exponential"`  ([#21055](https://github.com/Lightning-AI/pytorch-lightning/pull/21055))
+
+
 ---
 
 ## [2.5.2] - 2025-06-20