diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20ed71e..149c3a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
+## 0.4.2 (2026-01-28)
+
+New contributors:
+ - [@tdickinson29](https://github.com/tdickinson29)
+
+Fixed:
+ - When validating input with a source dataset, use the passed `time_dim` argument ([#62](https://github.com/xarray-contrib/xarray-regrid/pull/62)).
+ - Fixed issue with lon values being immutable, thanks @shenyulu ([#65](https://github.com/xarray-contrib/xarray-regrid/issues/65), [#66](https://github.com/xarray-contrib/xarray-regrid/pull/66)).
+  
 ## 0.4.1 (2025-04-08)
 
 Fixed:
diff --git a/src/xarray_regrid/__init__.py b/src/xarray_regrid/__init__.py
index 7b565fc..0dcaaec 100644
--- a/src/xarray_regrid/__init__.py
+++ b/src/xarray_regrid/__init__.py
@@ -9,4 +9,4 @@
     "methods",
 ]
 
-__version__ = "0.4.1"
+__version__ = "0.4.2"
diff --git a/src/xarray_regrid/utils.py b/src/xarray_regrid/utils.py
index 88bbab5..6979f84 100644
--- a/src/xarray_regrid/utils.py
+++ b/src/xarray_regrid/utils.py
@@ -379,7 +379,7 @@ def format_lon(
         left_pad = int(np.ceil(np.max([left_pad, 0])))
         right_pad = int(np.ceil(np.max([right_pad, 0])))
         obj = obj.pad({lon_coord: (left_pad, right_pad)}, mode="wrap", keep_attrs=True)
-        lon_vals = obj.coords[lon_coord].values
+        lon_vals = obj.coords[lon_coord].values.copy()
         if left_pad:
             lon_vals[:left_pad] = source_lon.values[-left_pad:] - 360
         if right_pad: