Prod Turso failing with `you are using a client with a deprecated version of sync`

I've been using Turso db, and one of the databases has started to give this error.

libsql::replication::remote_client] Failed handshake in 87 ms: Client(Status { code: Unimplemented, message: "you are using a client with a deprecated version of sync, that is not supported in this platform. Please upgrade your client", metadata: MetadataMap { headers: {"content-type": "application/grpc-web-text", "date": "xxx", "fly-request-id": "xxx", "content-length": "0", "server": "xxx", "via": "1.1 fly.io"} }, source: None })

I have upgraded the Rust libsql client to the latest (0.9.19), but I still get the same error.

  let db = Builder::new_remote_replica(
    ldb_path,
    DATABASE_URL,
    DATABASE_AUTH_TOKEN,
  )
  .sync_interval(Duration::from_secs(300))
  .build()
  .await?;

  db.sync().await?;

It's not clear what is deprecated as I've been using the default Rust client settings, and I could not find any API deprecation. I could not also find the error message in the source code of libsql.