Update CHANGELOG.md

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 All notable changes to this project will be documented in this file.
 We follow the [Semantic Versioning 2.0.0](http://semver.org/) format.
 
+## v4.x.x.x - 2024-01-03 - [PR#1382](https://github.com/NOAA-OWP/inundation-mapping/pull/1382)
+
+Cleans up Python files within `delineate_hydros_and_produce_HAND.sh` to improve performance, especially memory management, including removing unused imports, deleting object references when objects are no longer needed, and removing GDAL from the `fim_process_unit_wb.sh` step of FIM pipeline. Contributes to #1351 and #1376.
+
+### Changes
+- `data/create_vrt_file.py` and `tools/pixel_counter.py`: Removes unused import
+- `src/`
+    - `accumulate_headwaters.py`, `add_crosswalk.py`, `adjust_thalweg_lateral.py`, `filter_catchments_and_add_attributes.py`, `heal_bridges_osm.py`, `make_rem.py`, `make_stages_and_catchlist.py`, `mitigate_branch_outlet_backpool.py`, `reachID_grid_to_vector_points.py`, `split_flows.py`, `unique_pixel_and_allocation.py`: Deletes objects no longer in use
+    - `delineate_hydros_and_produce_HAND.sh`, `run_by_branch.sh`, `run_unit_wb.sh` : Updates arguments
+    - `getRasterInfoNative.py`: Refactors in `rasterio` (removed `gdal`)
+- `tools/evaluate_crosswalk.py`: Deletes objects no longer in use
+
+<br/><br/>
+
 ## v4.5.13.1 - 2024-12-13 - [PR#1361](https://github.com/NOAA-OWP/inundation-mapping/pull/1361)
 
 This PR was triggered by two dep-bot PR's. One for Tornado, one for aiohttp. Upon further research, these two exist only as dependencies for Jupyter and Jupyterlab which were very out of date. Upgrading Jupyter/JupyterLab took care of the other two.