diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 425ddc3..24eb6d4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
       - run: uv python install ${{ matrix.python }}
       - run: uv run ruff check src/obelisk/
       - run: uv run ruff format --check src/obelisk/
-      - run: uv run mypy src/obelisk/
+      - run: uv run mypy
   test:
     name: Run tests
     strategy:
diff --git a/hooks/pre-commit b/hooks/pre-commit
index f85e1ca..5fcd963 100755
--- a/hooks/pre-commit
+++ b/hooks/pre-commit
@@ -11,4 +11,4 @@
 exec 1>&2
 
 uv run ruff format --check src/obelisk/
-uv run mypy src/obelisk/
+uv run mypy
diff --git a/pyproject.toml b/pyproject.toml
index 4b88d89..41d965b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,3 +50,7 @@ dev = [
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/obelisk"]
+
+[tool.mypy]
+files = "src/obelisk"
+strict = true
diff --git a/src/obelisk/asynchronous/base.py b/src/obelisk/asynchronous/base.py
index 6a72a95..131d995 100644
--- a/src/obelisk/asynchronous/base.py
+++ b/src/obelisk/asynchronous/base.py
@@ -5,7 +5,7 @@
 
 import httpx
 
-from obelisk.exceptions import AuthenticationError
+from obelisk.exceptions import AuthenticationError, ObeliskError
 from obelisk.strategies.retry import RetryStrategy, NoRetryStrategy
 from obelisk.types import ObeliskKind
 
@@ -45,7 +45,7 @@ def __init__(
 
         self.log = logging.getLogger("obelisk")
 
-    async def _get_token(self):
+    async def _get_token(self) -> None:
         auth_string = str(
             base64.b64encode(f"{self._client}:{self._secret}".encode("utf-8")), "utf-8"
         )
@@ -60,6 +60,7 @@ async def _get_token(self):
         payload = {"grant_type": "client_credentials"}
 
         async with httpx.AsyncClient() as client:
+            request: httpx.Response | None = None
             response = None
             last_error = None
             retry = self.retry_strategy.make()
@@ -81,6 +82,9 @@ async def _get_token(self):
             if response is None and last_error is not None:
                 raise last_error
 
+            if request is None:
+                raise last_error or ObeliskError("Could not create HTTP request")
+
             if request.status_code != 200:
                 if "error" in response:
                     self.log.warning(f"Could not authenticate, {response['error']}")
@@ -91,9 +95,11 @@ async def _get_token(self):
                 seconds=response["expires_in"]
             )
 
-    async def _verify_token(self):
-        if self._token is None or self._token_expires < (
-            datetime.now() - self.grace_period
+    async def _verify_token(self) -> None:
+        if (
+            self._token is None
+            or self._token_expires is None
+            or self._token_expires < (datetime.now() - self.grace_period)
         ):
             retry = self.retry_strategy.make()
             first = True
@@ -107,7 +113,7 @@ async def _verify_token(self):
                     continue
 
     async def http_post(
-        self, url: str, data: Any = None, params: Optional[dict] = None
+        self, url: str, data: Any = None, params: Optional[dict[str, str]] = None
     ) -> httpx.Response:
         """
         Send an HTTP POST request to Obelisk,
@@ -155,7 +161,9 @@ async def http_post(
                 raise last_error
             return response
 
-    async def http_get(self, url: str, params: Optional[dict] = None) -> httpx.Response:
+    async def http_get(
+        self, url: str, params: Optional[dict[str, str]] = None
+    ) -> httpx.Response:
         """
         Send an HTTP GET request to Obelisk,
         with proper auth.
diff --git a/src/obelisk/asynchronous/client.py b/src/obelisk/asynchronous/client.py
index 263928d..c900673 100644
--- a/src/obelisk/asynchronous/client.py
+++ b/src/obelisk/asynchronous/client.py
@@ -1,7 +1,7 @@
 import json
 from datetime import datetime, timedelta
 from math import floor
-from typing import AsyncGenerator, List, Literal, Optional
+from typing import Any, AsyncGenerator, List, Literal, Optional
 
 import httpx
 from pydantic import ValidationError
@@ -28,10 +28,10 @@ async def fetch_single_chunk(
         fields: Optional[List[str]] = None,
         from_timestamp: Optional[int] = None,
         to_timestamp: Optional[int] = None,
-        order_by: Optional[dict] = None,
-        filter_: Optional[dict] = None,
+        order_by: Optional[dict[str, Any]] = None,
+        filter_: Optional[dict[str, Any]] = None,
         limit: Optional[int] = None,
-        limit_by: Optional[dict] = None,
+        limit_by: Optional[dict[str, Any]] = None,
         cursor: Optional[str] = None,
     ) -> QueryResult:
         """
@@ -116,10 +116,10 @@ async def query(
         fields: Optional[List[str]] = None,
         from_timestamp: Optional[int] = None,
         to_timestamp: Optional[int] = None,
-        order_by: Optional[dict] = None,
-        filter_: Optional[dict] = None,
+        order_by: Optional[dict[str, Any]] = None,
+        filter_: Optional[dict[str, Any]] = None,
         limit: Optional[int] = None,
-        limit_by: Optional[dict] = None,
+        limit_by: Optional[dict[str, Any]] = None,
     ) -> List[Datapoint]:
         """
         Queries data from obelisk,
@@ -196,7 +196,7 @@ async def query_time_chunked(
         from_time: datetime,
         to_time: datetime,
         jump: timedelta,
-        filter_: Optional[dict] = None,
+        filter_: Optional[dict[str, Any]] = None,
         direction: Literal["asc", "desc"] = "asc",
     ) -> AsyncGenerator[List[Datapoint], None]:
         """
@@ -239,7 +239,7 @@ async def query_time_chunked(
     async def send(
         self,
         dataset: str,
-        data: List[dict],
+        data: List[dict[str, Any]],
         precision: TimestampPrecision = TimestampPrecision.MILLISECONDS,
         mode: IngestMode = IngestMode.DEFAULT,
     ) -> httpx.Response:
diff --git a/src/obelisk/asynchronous/core.py b/src/obelisk/asynchronous/core.py
index b8c1dc3..b342120 100644
--- a/src/obelisk/asynchronous/core.py
+++ b/src/obelisk/asynchronous/core.py
@@ -159,7 +159,7 @@ def check_datatype_needed(self) -> Self:
 
         return self
 
-    def to_dict(self) -> Dict:
+    def to_dict(self) -> dict[str, Any]:
         return self.model_dump(exclude_none=True, by_alias=True)
 
 
diff --git a/src/obelisk/sync/client.py b/src/obelisk/sync/client.py
index d145660..90d7bf0 100644
--- a/src/obelisk/sync/client.py
+++ b/src/obelisk/sync/client.py
@@ -1,7 +1,7 @@
 import asyncio
 from datetime import datetime, timedelta
 from math import floor
-from typing import Generator, List, Literal, Optional
+from typing import Any, Generator, List, Literal, Optional
 
 import httpx
 
@@ -49,10 +49,10 @@ def fetch_single_chunk(
         fields: Optional[List[str]] = None,
         from_timestamp: Optional[int] = None,
         to_timestamp: Optional[int] = None,
-        order_by: Optional[dict] = None,
-        filter_: Optional[dict] = None,
+        order_by: Optional[dict[str, Any]] = None,
+        filter_: Optional[dict[str, Any]] = None,
         limit: Optional[int] = None,
-        limit_by: Optional[dict] = None,
+        limit_by: Optional[dict[str, Any]] = None,
         cursor: Optional[str] = None,
     ) -> QueryResult:
         """
@@ -119,10 +119,10 @@ def query(
         fields: Optional[List[str]] = None,
         from_timestamp: Optional[int] = None,
         to_timestamp: Optional[int] = None,
-        order_by: Optional[dict] = None,
-        filter_: Optional[dict] = None,
+        order_by: Optional[dict[str, Any]] = None,
+        filter_: Optional[dict[str, Any]] = None,
         limit: Optional[int] = None,
-        limit_by: Optional[dict] = None,
+        limit_by: Optional[dict[str, Any]] = None,
     ) -> List[Datapoint]:
         """
         Queries data from obelisk,
@@ -182,7 +182,7 @@ def query_time_chunked(
         from_time: datetime,
         to_time: datetime,
         jump: timedelta,
-        filter_: Optional[dict] = None,
+        filter_: Optional[dict[str, Any]] = None,
         direction: Literal["asc", "desc"] = "asc",
     ) -> Generator[List[Datapoint], None, None]:
         """
@@ -225,7 +225,7 @@ def query_time_chunked(
     def send(
         self,
         dataset: str,
-        data: List[dict],
+        data: List[dict[str, Any]],
         precision: TimestampPrecision = TimestampPrecision.MILLISECONDS,
         mode: IngestMode = IngestMode.DEFAULT,
     ) -> httpx.Response:
diff --git a/src/obelisk/types/core.py b/src/obelisk/types/core.py
index 3630e01..d00ce55 100644
--- a/src/obelisk/types/core.py
+++ b/src/obelisk/types/core.py
@@ -69,7 +69,7 @@ def __str__(self) -> str:
         return f"'{self.left}'{self.op}{right}"
 
     @staticmethod
-    def _sstr(item: Any):
+    def _sstr(item: Any) -> str:
         """Smart string conversion"""
         if isinstance(item, datetime):
             return item.isoformat()