Unable to use sudo apt upgrade (giving 404 not found)

Question

Whenever I write sudo apt upgrade it is giving me this error I have elementary OS Hera 5.1.7

E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/pool/main/b/base-files/base-files_10.1ubuntu2.9+elementary22~ubuntu18.04.1_amd64.deb 404 Not Found [IP: 91.189.95.83 80] E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/pool/main/g/grub2-signed/grub-efi-amd64-signed_1.93.19+elementary21~ubuntu5.1.7.1+2.02-2ubuntu8.17+elementary22~ubuntu5.1.6.1_amd64.deb 404 Not Found [IP: 91.189.95.83 80] E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/pool/main/p/plank/plank_0.11.89+r1647+pkg6~ubuntu5.1.7.1_amd64.deb 404 Not Found [IP: 91.189.95.83 80] E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/pool/main/p/plank/libplank1_0.11.89+r1647+pkg6~ubuntu5.1.7.1_amd64.deb 404 Not Found [IP: 91.189.95.83 80] E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/pool/main/p/plank/libplank-common_0.11.89+r1647+pkg6~ubuntu5.1.7.1_all.deb 404 Not Found [IP: 91.189.95.83 80]