Oh my God, I've killed a day to find a solution. Thank you so much for this hint @Daria. This solution worked! But I don't understand why I had to break the aio http library and what is the problem with SSL if my project worked for a month, and then this happens from there - aiogram api.telegram.org:443 ssl:True [SSLCertVerificationError: (1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate in certificate chain (_ssl.c:1006)