diff --git a/matrix_keycloak_bot.py b/matrix_keycloak_bot.py
index e31117b..7a5f868 100644
--- a/matrix_keycloak_bot.py
+++ b/matrix_keycloak_bot.py
@@ -157,9 +157,11 @@ async def on_to_device(client: AsyncClient, event):
                 }
                 resp = await client.to_device(
                     "m.key.verification.ready",
-                    ready_content,
-                    event.sender,
-                    from_device,
+                    {
+                        event.sender: {
+                            from_device: ready_content
+                        }
+                    },
                 )
                 if isinstance(resp, ToDeviceError):
                     print(f"Failed to send verification ready: {resp}")