I had this exact issue (4 of my dev certificates were shown as untrusted) and the issue was solved by downloading The Worldwide Developer Relations - G3 (Expiring 02/20/2030 00:00:00 UTC) cert from (thanks azav) https://www.apple.com/certificateauthority/ After clicking on the link, the Cert file gets downloaded. Click on it (which will give you an option to install in the Keychain). Once installed all my certs are shown with green checkmarks. YAY! I can now embark on another journey of signing my electron app... Its good to be equipped with right certs for that journey as I have a feeling it will be an uphill climb...