Support Board
Date/Time: Mon, 19 Jan 2026 07:00:08 +0000
Post From: IBKR claims Deprecated TWS API version
| [2025-12-05 18:13:22] |
| User584084 - Posts: 317 |
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I am running SC Version 2717 and IB TWS Version 10.35. I only trade futures so I am not having any issues with sending orders to IB TWS. IB sent out an email Oct 20th about the need to update to IB TWS Version 10.37 because of changes to IB TWS because of LotSize Configuration. Not sure if this has anything to do with your issue but posting it as an FYI. See below: Interactive Brokers Urgent: Notice of Change to TWS API LotSize Configuration Dear Client, IBKR strives to constantly improve software security and performance, as well as ensure continued compliance with regulatory changes. As a result, we adjust on a regular basis the technical requirements and configuration needed to use our platforms and, in this case, TWS API. Due to an external SEC rule update (RIN 3235-AN23), we are required to enforce a change in the round lot sizes of US stock that will vary by price from November 3, 2025. To remove disruption to your trading operations, you must upgrade at a minimum to TWS and TWS API to 10.37 Stable or newer. If you are already using version 10.37 or above, you may have to ensure that you have ticked the setting “Send market data in lots for US stocks for dual-mode API clients.” This will ensure you remain informed of the true bid/ask/last sizes. Please consider this when managing your risk and use a supported configuration. Regards, Interactive Brokers Date Time Of Last Edit: 2025-12-05 19:53:15
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