diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c49b00..81439ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v4.2.1 - 2023-09-18
+
+- Allow timzone override in `localtime.parse_dt` [#93](https://github.com/octoenergy/xocto/pull/93)
+
 ## v4.2.0 - 2023-09-06
 
 - Add `localtime.parse_date` and `localtime.parse_dt` [#91](https://github.com/octoenergy/xocto/pull/91)
diff --git a/setup.py b/setup.py
index 24c7fa2..bc4b609 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 REPO_ROOT = path.abspath(path.dirname(__file__))
 
-VERSION = "4.2.0"
+VERSION = "4.2.1"
 
 with open(path.join(REPO_ROOT, "README.md"), encoding="utf-8") as f:
     long_description = f.read()
diff --git a/xocto/__init__.py b/xocto/__init__.py
index 0fd7811..aef46ac 100644
--- a/xocto/__init__.py
+++ b/xocto/__init__.py
@@ -1 +1 @@
-__version__ = "4.2.0"
+__version__ = "4.2.1"
diff --git a/xocto/localtime.py b/xocto/localtime.py
index 2fdecdb..6d06d0e 100644
--- a/xocto/localtime.py
+++ b/xocto/localtime.py
@@ -738,11 +738,11 @@ def parse_date(value: str) -> datetime_.date:
     return datetime_.date.fromisoformat(value)
 
 
-def parse_dt(value: str) -> datetime_.datetime:
+def parse_dt(value: str, tz: timezone.zoneinfo.ZoneInfo | None = None) -> datetime_.datetime:
     """
     Returns a datetime.datetime for a given ISO format date/time string.
 
     The date/time must be naive - not include timezone information.
     """
     _datetime = datetime_.datetime.fromisoformat(value)
-    return timezone.make_aware(_datetime)
+    return timezone.make_aware(_datetime, timezone=tz)