diff --git a/api/ovdashboard_api/core/calevent.py b/api/ovdashboard_api/core/calevent.py
index c22bbca..b3844db 100644
--- a/api/ovdashboard_api/core/calevent.py
+++ b/api/ovdashboard_api/core/calevent.py
@@ -6,16 +6,26 @@ Caches events using `timed_alru_cache`.
 
 import functools
 import logging
-from datetime import datetime
+from datetime import UTC, datetime
 from typing import Annotated, Self
 
-from pydantic import BaseModel, ConfigDict, StringConstraints
+from pydantic import AfterValidator, BaseModel, ConfigDict, StringConstraints
 from vobject.base import Component
 
 _logger = logging.getLogger(__name__)
 type StrippedStr = Annotated[str, StringConstraints(strip_whitespace=True)]
 
 
+def make_utc(v: datetime) -> datetime:
+    if v.tzinfo is None:
+        return v.replace(tzinfo=UTC)
+
+    return v
+
+
+type UTCDateTime = Annotated[datetime, AfterValidator(make_utc)]
+
+
 @functools.total_ordering
 class CalEvent(BaseModel):
     """
@@ -31,8 +41,8 @@ class CalEvent(BaseModel):
 
     summary: StrippedStr = ""
     description: StrippedStr = ""
-    dtstart: datetime = datetime.now()
-    dtend: datetime = datetime.now()
+    dtstart: UTCDateTime = datetime.now(UTC)
+    dtend: UTCDateTime = datetime.now(UTC)
 
     def __lt__(self, other: Self) -> bool:
         """
diff --git a/api/ovdashboard_api/core/dav/caldav.py b/api/ovdashboard_api/core/dav/caldav.py
index 3a0acb7..8ac5108 100644
--- a/api/ovdashboard_api/core/dav/caldav.py
+++ b/api/ovdashboard_api/core/dav/caldav.py
@@ -1,5 +1,5 @@
 import logging
-from datetime import datetime, timedelta
+from datetime import UTC, datetime, timedelta
 from typing import cast
 
 from asyncify import asyncify
@@ -69,7 +69,7 @@ class CalDAV:
         _logger.info(f"downloading {calendar_name!r} ...")
 
         dt_start = datetime.combine(
-            datetime.now().date(),
+            datetime.now(UTC).date(),
             datetime.min.time(),
         )
         dt_end = dt_start + timedelta(days=cfg.calendar.future_days)
diff --git a/api/pyproject.toml b/api/pyproject.toml
index d1381c3..eec1a63 100644
--- a/api/pyproject.toml
+++ b/api/pyproject.toml
@@ -3,7 +3,7 @@ authors = ["Jörn-Michael Miehe <jmm@yavook.de>"]
 description = ""
 include = ["ovdashboard_api/skel/*"]
 name = "ovdashboard_api"
-version = "0.2.0"
+version = "0.2.1"
 
 [tool.poetry.dependencies]
 Markdown = "^3.5.1"
@@ -25,8 +25,8 @@ webdavclient3 = "^3.14.6"
 black = "^23.11.0"
 flake8 = "^6.1.0"
 flake8-isort = "^6.1.1"
-types-cachetools = "^5.3.0.7"
 pytest = "^7.4.3"
+types-cachetools = "^5.3.0.7"
 
 [tool.poetry.scripts]
 ovdashboard-api = "ovdashboard_api.main:main"
diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index 808f819..f24f864 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -11,7 +11,7 @@ services:
       - "127.0.0.1:6379:6379"
 
   app:
-    image: code.yavook.de/oekzident.de/ovdashboard:0.2.0
+    image: code.yavook.de/oekzident.de/ovdashboard:0.2.1
     restart: always
     pull_policy: always
     depends_on:
diff --git a/deploy/install.sh b/deploy/install.sh
index 0250a6d..32e3562 100644
--- a/deploy/install.sh
+++ b/deploy/install.sh
@@ -5,7 +5,7 @@
 #########
 
 # env setup
-ovd_version="0.2.0"
+ovd_version="0.2.1"
 export DEBIAN_FRONTEND="noninteractive"
 set -e
 
diff --git a/ui/package.json b/ui/package.json
index 24a6284..acca596 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ovdashboard-ui",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "private": true,
   "scripts": {
     "serve": "vue-cli-service serve",