diff --git a/flake.nix b/flake.nix
index 551bf16..570fb18 100644
--- a/flake.nix
+++ b/flake.nix
@@ -86,6 +86,7 @@
                         dontConfigure = true;
                         dontInstall = true;
                         buildPhase = ''
+                          mypy --version
                           mkdir $out
                           mypy --strict huecli --junit-xml $out/junit.xml
                         '';
diff --git a/huecli/__main__.py b/huecli/__main__.py
index 55e4996..8ed1256 100644
--- a/huecli/__main__.py
+++ b/huecli/__main__.py
@@ -25,7 +25,7 @@ NAME_TO_ID = {
     "office": "0x001788010e371aa4",
     "all": "all_lights",
     "infuse": "infuse_group",
-    "living_room": "living_room"
+    "living_room": "living_room",
 }
 COLOR_MAP = {
     "red": (0.6942, 0.2963),
@@ -50,14 +50,14 @@ class LightID(str, Enum):
     livingroom = "living_room"
 
 
-def get_mqtt_broker():
+def get_mqtt_broker() -> str:
     if "HUECLI_BROKER" in os.environ:
         return os.environ["HUECLI_BROKER"]
     else:
         return MQTT_BROKER
 
 
-def complete_color(incomplete: str):
+def complete_color(incomplete: str) -> list[str]:
     completion = []
     for color in COLOR_MAP:
         if color.startswith(incomplete):
@@ -65,7 +65,7 @@ def complete_color(incomplete: str):
     return completion
 
 
-def complete_id(incomplete: str):
+def complete_id(incomplete: str) -> list[str]:
     completion = []
     for id in NAME_TO_ID:
         if id.startswith(incomplete):
@@ -73,7 +73,7 @@ def complete_id(incomplete: str):
     return completion
 
 
-def complete_state(incomplete: str):
+def complete_state(incomplete: str) -> list[str]:
     states = ["on", "off"]
     completion = []
     for id in states:
@@ -82,7 +82,7 @@ def complete_state(incomplete: str):
     return completion
 
 
-def rgb_to_xy(red, green, blue) -> XYColor:
+def rgb_to_xy(red: float, green: float, blue: float) -> XYColor:
     """conversion of RGB colors to CIE1931 XY colors
     Formulas implemented from: https://gist.github.com/popcorn245/30afa0f98eea1c2fd34d
 
@@ -132,7 +132,7 @@ def set_color(
     color: Annotated[
         str, typer.Argument(help="Color to set", autocompletion=complete_color)
     ],
-):
+) -> None:
     """
     Set the color of ID to COLOR where COLOR is either a known color value,
     or a comma separated RGB value, like "0.1,0.2,0.3".
@@ -158,7 +158,7 @@ def set_state(
         LightState,
         typer.Argument(help="State of light.", autocompletion=complete_state),
     ],
-):
+) -> None:
     """
     Set the state of ID to STATE
     """
@@ -175,7 +175,7 @@ def set_brightness(
         LightID, typer.Argument(help="ID of light.", autocompletion=complete_id)
     ],
     brightness: int,
-):
+) -> None:
     """
     Set brigthness of ID to BRIGHTNESS
     """
@@ -186,6 +186,7 @@ def set_brightness(
     payload = json.dumps({"brightness": brightness})
     pub.single(topic, payload, hostname=get_mqtt_broker())
 
+
 @app.command()
 @app.command("get", hidden=True)
 def get_state(
@@ -193,9 +194,10 @@ def get_state(
         LightID, typer.Argument(help="ID of light.", autocompletion=complete_id)
     ],
     as_json: Annotated[
-        bool, typer.Option("--json", help="Print state as json."),
-    ] = False
-    ):
+        bool,
+        typer.Option("--json", help="Print state as json."),
+    ] = False,
+) -> None:
     """
     Get the state of ID
     """
@@ -204,15 +206,16 @@ def get_state(
     resp_topic = f"zigbee2mqtt/{str_id}"
     payload = json.dumps({"state": ""})
     pub.single(topic, payload, hostname=get_mqtt_broker())
-    resp = sub.simple(resp_topic, hostname=get_mqtt_broker())
+    resp = sub.simple(resp_topic, hostname=get_mqtt_broker())  # type: ignore[no-untyped-call]
     data = json.loads(resp.payload.decode("utf-8"))
     if as_json:
         print(json.dumps(data))
     else:
         print(f"{data['state']}")
 
+
 @app.command()
-def version():
+def version() -> None:
     """
     Print huecli version
     """
@@ -244,7 +247,7 @@ def _parse_rgb_color(r: float, g: float, b: float) -> XYColor:
     raise ValueError("RGB values must be between 0 and 255 or 0.0 and 1.0")
 
 
-def main():
+def main() -> None:
     app()