Hi @barisunz, I faced the same error yesterday (Step ). I'm not sure if the reason of the error is the same, anyway I performed the following step in order to solve the upload problem: uninstalled the Transporter.app (useless in my case) installed the iTMSTransporter from the link mentioned by @JZ4L3SK1 updated fastlane version (the idea behind the most recent fastlane version is to search the iTMSTransporter bin in the /usr/local/itms folder, unless you hard coded the itms path in the FASTLANE_ITUNES_TRANSPORTER_PATH ENV var) removed old ENV config hard coded in the fastlane script that was forcing fastlane to use the iTMSTransporter version bundled with Transport.app (that is older) After that, fastlane script was able to run the newest iTMSTransporter version and it was not necessary to switch to altool. Let me know if it can be helpful.