diff --git a/spaceapi/auth.py b/spaceapi/auth.py
--- a/spaceapi/auth.py
+++ b/spaceapi/auth.py
@@ -1,5 +1,5 @@
 from hmac import compare_digest
-from typing import Optional
+from typing import Optional, cast
 
 from flask import current_app
 from flask_httpauth import HTTPBasicAuth, HTTPDigestAuth
@@ -11,7 +11,7 @@ httpauth = HTTPDigestAuth()
 @httpauth.get_password
 def get_pw(username: str) -> Optional[str]:
     if username in current_app.config["HTTP_DIGEST_AUTH_USERS"]:
-        return current_app.config["HTTP_DIGEST_AUTH_USERS"][username]
+        return cast(str, current_app.config["HTTP_DIGEST_AUTH_USERS"][username])
     return None
 
 
diff --git a/spaceapi/sensors.py b/spaceapi/sensors.py
--- a/spaceapi/sensors.py
+++ b/spaceapi/sensors.py
@@ -1,7 +1,8 @@
 import json
+from typing import Any, Dict, cast
 
 import jsonschema
-from flask import Blueprint, abort, current_app, jsonify, request
+from flask import Blueprint, Response, abort, current_app, jsonify, request
 from pkg_resources import resource_filename
 
 from .auth import httpauth
@@ -16,12 +17,12 @@ ALLOWED_SENSORS_KEYS = json.load(
 
 @sensors_views.route("/set/<key>", methods=["POST"])
 @httpauth.login_required
-def set_sensors(key):
+def set_sensors(key: str) -> Response:
 
     active = ActiveStatusv14()
 
     if key in ALLOWED_SENSORS_KEYS and key in active["sensors"]:
-        data = request.json
+        data = cast(Dict[str, Any], request.json)
         try:
             try:
                 jsonschema.validate(data, ALLOWED_SENSORS_KEYS[key])
diff --git a/spaceapi/utils.py b/spaceapi/utils.py
--- a/spaceapi/utils.py
+++ b/spaceapi/utils.py
@@ -54,11 +54,11 @@ RADIATON_SUBKEYS = frozenset(("alpha", "
 
 
 class Singleton:
-    def __new__(cls, *args, **kwargs):
+    def __new__(cls, *args: Any, **kwargs: Any) -> Any:
         key = str(hash(cls))
 
         if not hasattr(cls, "_instance_dict"):
-            cls._instance_dict = {}
+            cls._instance_dict = {}  # type: Dict[str, Any]
 
         if key not in cls._instance_dict:
             cls._instance_dict[key] = super().__new__(cls, *args, **kwargs)
@@ -67,7 +67,7 @@ class Singleton:
 
 
 class ActiveStatusv14(Singleton, dict):
-    def __init__(self):
+    def __init__(self) -> None:
         self.default_json_file = default_json_file_v14
         self.last_state_file = last_state_file_v14