If you want to change your build secret at any point, it’s easy to do! Just head to your organization’s settings page and click on the “Build Secret” link underneath your organization's name. Select "Change Build Secret" and the "Change" button in the dialog box.
Note: Only organization administrators have the option to change the build secret.
Once you’ve changed your build secret, make sure to update it in your projects.
Replace the existing apiSecret with the new value in your crashlytics.properties or fabric.properties file in the root your project. You may want to commit this to source control to ensure that the entire team gets the updated value.
Update the build secret in your run script build phase and any place you are invoking the submit tool.