diff --git a/src/pydase/utils/serialization/serializer.py b/src/pydase/utils/serialization/serializer.py
index e6109df..92970e9 100644
--- a/src/pydase/utils/serialization/serializer.py
+++ b/src/pydase/utils/serialization/serializer.py
@@ -167,10 +167,12 @@ class Serializer:
     def _serialize_dict(obj: dict[str, Any], access_path: str = "") -> SerializedDict:
         readonly = False
         doc = get_attribute_doc(obj)
-        value = {
-            key: Serializer.serialize_object(val, access_path=f'{access_path}["{key}"]')
-            for key, val in obj.items()
-        }
+        value = {}
+        for key, val in obj.items():
+            processed_key = key if not isinstance(key, str) else f'"{key}"'
+            value[key] = Serializer.serialize_object(
+                val, access_path=f"{access_path}[{processed_key}]"
+            )
         return {
             "full_access_path": access_path,
             "type": "dict",
diff --git a/tests/utils/serialization/test_serializer.py b/tests/utils/serialization/test_serializer.py
index d566160..1100425 100644
--- a/tests/utils/serialization/test_serializer.py
+++ b/tests/utils/serialization/test_serializer.py
@@ -397,7 +397,7 @@ def test_dict_serialization() -> None:
 
     test_dict = {
         "int_key": 1,
-        "float_key": 1.0,
+        1.0: 1.0,
         "bool_key": True,
         "Quantity_key": 1.0 * u.units.s,
         "DataService_key": MyClass(),
@@ -439,8 +439,8 @@ def test_dict_serialization() -> None:
                 "type": "bool",
                 "value": True,
             },
-            "float_key": {
-                "full_access_path": '["float_key"]',
+            1.0: {
+                "full_access_path": "[1.0]",
                 "doc": None,
                 "readonly": False,
                 "type": "float",