diff --git a/changelog/535.fixed.md b/changelog/535.fixed.md
index fdbd499e..56c8fd43 100644
--- a/changelog/535.fixed.md
+++ b/changelog/535.fixed.md
@@ -1 +1 @@
-Fix branch handling in `_run_transform` and `execute_graphql_query` functions in Infrahubctl to use environment variables for branch management. 
\ No newline at end of file
+Fix branch handling in `_run_transform` and `execute_graphql_query` functions in Infrahubctl to use environment variables for branch management.
\ No newline at end of file
diff --git a/changelog/549.fixed.md b/changelog/549.fixed.md
new file mode 100644
index 00000000..1a4f975c
--- /dev/null
+++ b/changelog/549.fixed.md
@@ -0,0 +1 @@
+Allow the ability to clear optional attributes by setting them to None if they have been mutated by the user.
\ No newline at end of file
diff --git a/infrahub_sdk/node/attribute.py b/infrahub_sdk/node/attribute.py
index 5ddc5cbe..9c752521 100644
--- a/infrahub_sdk/node/attribute.py
+++ b/infrahub_sdk/node/attribute.py
@@ -76,6 +76,8 @@ def _generate_input_data(self) -> dict | None:
         variables: dict[str, Any] = {}
 
         if self.value is None:
+            if self._schema.optional and self.value_has_been_mutated:
+                data["value"] = None
             return data
 
         if isinstance(self.value, str):
diff --git a/tests/unit/sdk/conftest.py b/tests/unit/sdk/conftest.py
index 5f0d7c2a..92749412 100644
--- a/tests/unit/sdk/conftest.py
+++ b/tests/unit/sdk/conftest.py
@@ -177,6 +177,48 @@ async def location_schema() -> NodeSchemaAPI:
     return NodeSchema(**data).convert_api()  # type: ignore
 
 
+@pytest.fixture
+async def location_schema_with_dropdown() -> NodeSchemaAPI:
+    data = {
+        "name": "Location",
+        "namespace": "Builtin",
+        "default_filter": "name__value",
+        "attributes": [
+            {"name": "name", "kind": "String", "unique": True},
+            {"name": "description", "kind": "String", "optional": True},
+            {"name": "type", "kind": "String"},
+            {
+                "name": "status",
+                "kind": "Dropdown",
+                "optional": True,
+                "choices": [{"name": "active", "label": "Active"}, {"name": "planning", "label": "Planning"}],
+            },
+        ],
+        "relationships": [
+            {
+                "name": "tags",
+                "peer": "BuiltinTag",
+                "optional": True,
+                "cardinality": "many",
+            },
+            {
+                "name": "primary_tag",
+                "peer": "BuiltinTag",
+                "optional": True,
+                "cardinality": "one",
+            },
+            {
+                "name": "member_of_groups",
+                "peer": "CoreGroup",
+                "optional": True,
+                "cardinality": "many",
+                "kind": "Group",
+            },
+        ],
+    }
+    return NodeSchema(**data).convert_api()  # type: ignore
+
+
 @pytest.fixture
 async def schema_with_hfid() -> dict[str, NodeSchemaAPI]:
     data = {
diff --git a/tests/unit/sdk/test_node.py b/tests/unit/sdk/test_node.py
index c5c75052..e4192871 100644
--- a/tests/unit/sdk/test_node.py
+++ b/tests/unit/sdk/test_node.py
@@ -1370,6 +1370,34 @@ async def test_create_input_data(client, location_schema: NodeSchemaAPI, client_
     }
 
 
+@pytest.mark.parametrize("client_type", client_types)
+async def test_create_input_data_with_dropdown(client, location_schema_with_dropdown, client_type) -> None:
+    """Validate input data including dropdown field"""
+    data = {
+        "name": {"value": "JFK1"},
+        "description": {"value": "JFK Airport"},
+        "type": {"value": "SITE"},
+        "status": {"value": "active"},
+    }
+
+    if client_type == "standard":
+        node = InfrahubNode(client=client, schema=location_schema_with_dropdown, data=data)
+    else:
+        node = InfrahubNodeSync(client=client, schema=location_schema_with_dropdown, data=data)
+
+    assert node.status.value == "active"
+    node.status = None
+    assert node._generate_input_data()["data"] == {
+        "data": {
+            "name": {"value": "JFK1"},
+            "description": {"value": "JFK Airport"},
+            "type": {"value": "SITE"},
+            "status": {"value": None},
+            "primary_tag": None,
+        }
+    }
+
+
 @pytest.mark.parametrize("client_type", client_types)
 async def test_create_input_data__with_relationships_02(client, location_schema, client_type) -> None:
     """Validate input data with variables that needs replacements"""