diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 58a98ae..8079a84 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,7 +9,7 @@ repos:
     rev: v2.31.1
     hooks:
       - id: pyupgrade
-        args: [--py39-plus]
+        args: [--py310-plus]
   - repo: https://github.com/psf/black
     rev: 22.3.0
     hooks:
diff --git a/bumper/mqtt/helper_bot.py b/bumper/mqtt/helper_bot.py
index e90e623..960c3c5 100644
--- a/bumper/mqtt/helper_bot.py
+++ b/bumper/mqtt/helper_bot.py
@@ -19,9 +19,9 @@ class CommandDto:
     def __init__(self, payload_type: str) -> None:
         self._payload_type = payload_type
         self._event = asyncio.Event()
-        self._response: Union[str, bytes]
+        self._response: str | bytes
 
-    async def wait_for_response(self) -> Union[str, dict[str, Any]]:
+    async def wait_for_response(self) -> str | dict[str, Any]:
         """Wait for the response to be received."""
         await self._event.wait()
         if self._payload_type == "j":
@@ -29,7 +29,7 @@ class CommandDto:
 
         return str(self._response)
 
-    def add_response(self, response: Union[str, bytes]) -> None:
+    def add_response(self, response: str | bytes) -> None:
         """Add received response."""
         self._response = response
         self._event.set()
diff --git a/bumper/util.py b/bumper/util.py
index a3c2674..2262a7e 100644
--- a/bumper/util.py
+++ b/bumper/util.py
@@ -46,7 +46,7 @@ def get_logger(name: str, rotate: RotatingFileHandler = None) -> logging.Logger:
     return logger
 
 
-def convert_to_millis(seconds: Union[int, float]) -> int:
+def convert_to_millis(seconds: int | float) -> int:
     """Convert seconds to milliseconds."""
     return int(round(seconds * 1000))
 
diff --git a/bumper/web/server.py b/bumper/web/server.py
index 565a141..dc4a582 100644
--- a/bumper/web/server.py
+++ b/bumper/web/server.py
@@ -58,7 +58,7 @@ class WebServer:
 
     _EXCLUDE_FROM_LOGGING = ["base", "remove-bot", "remove-client", "restart-service"]
 
-    def __init__(self, bindings: Union[list[WebserverBinding], WebserverBinding]):
+    def __init__(self, bindings: list[WebserverBinding] | WebserverBinding):
         self._runners: list[web.AppRunner] = []
 
         if isinstance(bindings, WebserverBinding):
diff --git a/mypy.ini b/mypy.ini
index c3c86d1..cf8830c 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,5 +1,5 @@
 [mypy]
-python_version = 3.9
+python_version = 3.10
 show_error_codes = true
 follow_imports = silent
 ignore_missing_imports = true