diff --git a/spond/spond.py b/spond/spond.py
index 110374b..00055b6 100644
--- a/spond/spond.py
+++ b/spond/spond.py
@@ -383,3 +383,27 @@ async def get_export(self, uid: str) -> bytes:
             output_data = await r.read()
             return output_data
 
+    @SpondBase.require_authentication
+    async def change_response(self, uid: str, user: str, payload: dict) -> dict:
+        """change a user's response for an event
+
+        Parameters
+        ----------
+        uid : str
+            UID of the event.
+
+        user : str
+            UID of the user
+
+        payload : dict
+            user response to event, e.g. {"accepted": "true"}
+
+        Returns
+        ----------
+            json: event["responses"] with updated info
+        """
+        url = f"{self.api_url}sponds/{uid}/responses/{user}"
+        async with self.clientsession.put(
+            url, headers=self.auth_headers, json=payload
+        ) as r:
+            return await r.json()
diff --git a/tests/test_spond.py b/tests/test_spond.py
index c5c22bd..e6f0703 100644
--- a/tests/test_spond.py
+++ b/tests/test_spond.py
@@ -7,6 +7,7 @@
 
 MOCK_USERNAME, MOCK_PASSWORD = "MOCK_USERNAME", "MOCK_PASSWORD"
 MOCK_TOKEN = "MOCK_TOKEN"
+MOCK_PAYLOAD = {"accepted": "false", "declineMessage": "sick cannot make it"}
 
 
 # Mock the `require_authentication` decorator to bypass authentication
@@ -55,6 +56,11 @@ def mock_token():
     return MOCK_TOKEN
 
 
+@pytest.fixture
+def mock_payload():
+    return MOCK_PAYLOAD
+
+
 @pytest.mark.asyncio
 async def test_get_event__happy_path(mock_events, mock_token):
     """Test that a valid `id` returns the matching event."""
@@ -156,3 +162,36 @@ async def test_get_export(mock_get, mock_token):
         },
     )
     assert data == mock_binary
+
+
+@pytest.mark.asyncio
+@patch("aiohttp.ClientSession.put")
+async def test_change_response(mock_put, mock_payload, mock_token):
+    s = Spond(MOCK_USERNAME, MOCK_PASSWORD)
+    s.token = mock_token
+
+    mock_response_data = {
+        "acceptedIds": ["PID1", "PID2"],
+        "declinedIds": ["PID3"],
+        "unansweredIds": [],
+        "waitinglistIds": [],
+        "unconfirmedIds": [],
+        "declineMessages": {"PID3": "sick cannot make it"},
+    }
+    mock_put.return_value.__aenter__.return_value.status = 200
+    mock_put.return_value.__aenter__.return_value.json = AsyncMock(
+        return_value=mock_response_data
+    )
+
+    response = await s.change_response(uid="ID1", user="PID3", payload=mock_payload)
+
+    mock_url = "https://api.spond.com/core/v1/sponds/ID1/responses/PID3"
+    mock_put.assert_called_once_with(
+        mock_url,
+        headers={
+            "content-type": "application/json",
+            "Authorization": f"Bearer {mock_token}",
+        },
+        json=mock_payload,
+    )
+    assert response == mock_response_data