diff --git a/api/.vscode/settings.json b/api/.vscode/settings.json
index 2607a64..2de9c9c 100644
--- a/api/.vscode/settings.json
+++ b/api/.vscode/settings.json
@@ -12,5 +12,6 @@
   "editor.codeActionsOnSave": {
     "source.organizeImports": true
   },
-  "git.closeDiffOnOperation": true
+  "git.closeDiffOnOperation": true,
+  "python.analysis.typeCheckingMode": "basic"
 }
\ No newline at end of file
diff --git a/api/ovdashboard_api/async_helpers.py b/api/ovdashboard_api/async_helpers.py
index 82677df..d765086 100644
--- a/api/ovdashboard_api/async_helpers.py
+++ b/api/ovdashboard_api/async_helpers.py
@@ -5,25 +5,30 @@ Some useful helpers for working in async contexts.
 from asyncio import get_running_loop
 from functools import partial, wraps
 from time import time
+from typing import Awaitable, Callable, TypeVar
 
 from async_lru import alru_cache
 
 from .settings import SETTINGS
 
+RT = TypeVar("RT")
 
-def run_in_executor(f):
+
+def run_in_executor(
+    function: Callable[..., RT]
+) -> Callable[..., Awaitable[RT]]:
     """
     Decorator to make blocking a function call asyncio compatible.
     https://stackoverflow.com/questions/41063331/how-to-use-asyncio-with-existing-blocking-library/
     https://stackoverflow.com/a/53719009
     """
 
-    @wraps(f)
-    async def wrapper(*args, **kwargs):
+    @wraps(function)
+    async def wrapper(*args, **kwargs) -> RT:
         loop = get_running_loop()
         return await loop.run_in_executor(
             None,
-            partial(f, *args, **kwargs),
+            partial(function, *args, **kwargs),
         )
 
     return wrapper
diff --git a/api/ovdashboard_api/config.py b/api/ovdashboard_api/config.py
index 0f5229e..77f2bd7 100644
--- a/api/ovdashboard_api/config.py
+++ b/api/ovdashboard_api/config.py
@@ -69,7 +69,7 @@ class Config(BaseModel):
 
         try:
             return cls.parse_obj(
-                toml_loads(await dav_file.string)
+                toml_loads(await dav_file.as_string)
             )
 
         except RemoteResourceNotFound:
diff --git a/api/ovdashboard_api/dav_calendar.py b/api/ovdashboard_api/dav_calendar.py
index 98bd885..88c302a 100644
--- a/api/ovdashboard_api/dav_calendar.py
+++ b/api/ovdashboard_api/dav_calendar.py
@@ -13,7 +13,7 @@ from typing import Iterator
 from caldav import Calendar
 from caldav.lib.error import ReportError
 from pydantic import BaseModel, validator
-from vobject.icalendar import VEvent
+from vobject.base import Component
 
 from .async_helpers import get_ttl_hash, run_in_executor, timed_alru_cache
 from .config import Config
@@ -76,7 +76,7 @@ class CalEvent(BaseModel):
     )(_string_strip)
 
     @classmethod
-    def from_vevent(cls, event: VEvent) -> "CalEvent":
+    def from_vevent(cls, event: Component) -> "CalEvent":
         """
         Create a CalEvent instance from a `VObject.VEvent` object.
         """
@@ -85,7 +85,7 @@ class CalEvent(BaseModel):
 
         for key in cls().dict().keys():
             try:
-                data[key] = event.contents[key][0].value
+                data[key] = event.contents[key][0].value  # type: ignore
 
             except KeyError:
                 pass
@@ -123,7 +123,7 @@ async def _get_calendar_events(
     search_span = timedelta(days=cfg.calendar.future_days)
 
     @run_in_executor
-    def _inner() -> Iterator[VEvent]:
+    def _inner() -> Iterator[Component]:
         """
         Get events by CalDAV calendar name.
 
@@ -156,11 +156,9 @@ async def _get_calendar_events(
                 expand=False,
             )
 
-        return (
-            vevent
-            for event in search_result
-            for vevent in event.vobject_instance.contents["vevent"]
-        )
+        for event in search_result:
+            vobject: Component = event.vobject_instance  # type: ignore
+            yield from vobject.vevent_list
 
     return sorted([
         CalEvent.from_vevent(vevent)
@@ -183,7 +181,7 @@ class DavCalendar:
         """
 
         return await _get_calendar(
-            ttl_hash=get_ttl_hash(),
+            ttl_hash=get_ttl_hash(),  # type: ignore
             calendar_name=self.calendar_name,
         )
 
@@ -194,6 +192,6 @@ class DavCalendar:
         """
 
         return await _get_calendar_events(
-            ttl_hash=get_ttl_hash(),
+            ttl_hash=get_ttl_hash(),  # type: ignore
             calendar_name=self.calendar_name,
         )
diff --git a/api/ovdashboard_api/dav_common.py b/api/ovdashboard_api/dav_common.py
index 5c7a61a..f93db1e 100644
--- a/api/ovdashboard_api/dav_common.py
+++ b/api/ovdashboard_api/dav_common.py
@@ -112,6 +112,6 @@ def caldav_list() -> Iterator[str]:
     """
 
     return (
-        cal.name
+        str(cal.name)
         for cal in caldav_principal().calendars()
     )
diff --git a/api/ovdashboard_api/dav_file.py b/api/ovdashboard_api/dav_file.py
index ca914fb..f6d8887 100644
--- a/api/ovdashboard_api/dav_file.py
+++ b/api/ovdashboard_api/dav_file.py
@@ -61,12 +61,12 @@ class DavFile:
         """
 
         return await _get_buffer(
-            ttl_hash=get_ttl_hash(),
+            ttl_hash=get_ttl_hash(),  # type: ignore
             remote_path=self.remote_path,
         )
 
     @property
-    async def bytes(self) -> bytes:
+    async def as_bytes(self) -> bytes:
         """
         File contents as binary data.
         """
@@ -77,12 +77,12 @@ class DavFile:
         return buffer.read()
 
     @property
-    async def string(self) -> str:
+    async def as_string(self) -> str:
         """
         File contents as string.
         """
 
-        bytes = await self.bytes
+        bytes = await self.as_bytes
         return bytes.decode(encoding="utf-8")
 
     async def write(self, content: bytes) -> None:
diff --git a/api/ovdashboard_api/routers/_common.py b/api/ovdashboard_api/routers/_common.py
index f633299..ce55049 100644
--- a/api/ovdashboard_api/routers/_common.py
+++ b/api/ovdashboard_api/routers/_common.py
@@ -13,7 +13,6 @@ from ..config import Config
 from ..dav_common import caldav_list, webdav_list
 
 
-@dataclass(frozen=True)
 class NameLister(Protocol):
     """
     Can be called to create an iterator containing some names.
diff --git a/api/ovdashboard_api/routers/cal_aggregate.py b/api/ovdashboard_api/routers/cal_aggregate.py
index 577d83b..036b3cf 100644
--- a/api/ovdashboard_api/routers/cal_aggregate.py
+++ b/api/ovdashboard_api/routers/cal_aggregate.py
@@ -50,6 +50,6 @@ async def get_aggregate_calendar(
 
     return sorted([
         event
-        async for calendar in calendars
+        async for calendar in calendars  # type: ignore
         for event in (await calendar.events)
     ])
diff --git a/api/ovdashboard_api/routers/image.py b/api/ovdashboard_api/routers/image.py
index b9d70fa..2ef8ab9 100644
--- a/api/ovdashboard_api/routers/image.py
+++ b/api/ovdashboard_api/routers/image.py
@@ -62,12 +62,12 @@ async def find_images(
 async def get_image(
     prefix: str,
     name: str = Depends(image_unique),
-) -> str:
+) -> StreamingResponse:
     cfg = await Config.get()
 
     dav_file = DavFile(f"{image_lister.remote_path}/{name}")
     img = Image.open(
-        BytesIO(await dav_file.bytes)
+        BytesIO(await dav_file.as_bytes)
     ).convert(
         cfg.image.mode
     )
diff --git a/api/ovdashboard_api/routers/text.py b/api/ovdashboard_api/routers/text.py
index 323ad7b..30eb511 100644
--- a/api/ovdashboard_api/routers/text.py
+++ b/api/ovdashboard_api/routers/text.py
@@ -34,7 +34,7 @@ text_unique = PrefixUnique(text_finder)
 
 
 async def get_ticker_lines() -> Iterator[str]:
-    ticker = await DavFile("text/ticker.txt").string
+    ticker = await DavFile("text/ticker.txt").as_string
 
     return (
         line.strip()
@@ -59,8 +59,9 @@ async def get_ticker_content(
     ticker_content_lines: Iterator[str] = Depends(get_ticker_content_lines),
 ) -> str:
     cfg = await Config.get()
-    ticker_content_lines = ["", *ticker_content_lines, ""]
-    ticker_content = cfg.ticker.separator.join(ticker_content_lines)
+    ticker_content = cfg.ticker.separator.join(
+        ["", *ticker_content_lines, ""],
+    )
 
     return ticker_content.strip()
 
@@ -104,7 +105,7 @@ async def find_texts(
 async def get_text_content(
     name: str = Depends(text_unique),
 ) -> str:
-    return await DavFile(f"{text_lister.remote_path}/{name}").string
+    return await DavFile(f"{text_lister.remote_path}/{name}").as_string
 
 
 @router.get(
diff --git a/api/ovdashboard_api/settings.py b/api/ovdashboard_api/settings.py
index 5a6ef44..c41967e 100644
--- a/api/ovdashboard_api/settings.py
+++ b/api/ovdashboard_api/settings.py
@@ -7,7 +7,7 @@ Converts per-run (environment) variables and config files into the
 Pydantic models might have convenience methods attached.
 """
 
-from typing import Optional
+from typing import Any, Optional
 
 from pydantic import BaseModel, BaseSettings, root_validator
 
@@ -17,11 +17,11 @@ class DavSettings(BaseModel):
     Connection to a DAV server.
     """
 
-    protocol: Optional[str]
-    host: Optional[str]
-    username: Optional[str]
-    password: Optional[str]
-    path: Optional[str]
+    protocol: Optional[str] = None
+    host: Optional[str] = None
+    username: Optional[str] = None
+    password: Optional[str] = None
+    path: Optional[str] = None
 
     @property
     def url(self) -> str:
@@ -65,11 +65,13 @@ class Settings(BaseSettings):
     caldav: DavSettings = DavSettings()
 
     class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
         env_nested_delimiter = "__"
 
     @root_validator(pre=True)
     @classmethod
-    def validate_dav_settings(cls, values):
+    def validate_dav_settings(cls, values: dict[str, Any]) -> dict[str, Any]:
         # ensure both settings dicts are created
         for key in ("webdav", "caldav"):
             if key not in values:
@@ -96,4 +98,4 @@ class Settings(BaseSettings):
         return values
 
 
-SETTINGS = Settings(_env_file=".env")
+SETTINGS = Settings()