Debian 10 - Update Error

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$ sudo apt-get update

Get:1 http://ftp.debian.org/debian buster-backports InRelease [46.7 kB]

Hit:2 https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease                

Hit:3 https://deb.qubes-os.org/r4.0/vm buster InRelease                        

Hit:4 https://deb.debian.org/debian buster InRelease                       

Get:5 https://deb.debian.org/debian-security buster/updates InRelease [65.4 kB]

Err:2 https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease

  The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key

Fetched 112 kB in 1s (134 kB/s)     

Reading package lists... Done

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://contrib.qubes-os.org/deb/r4.0/vm buster InRelease: The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key

W: Failed to fetch https://contrib.qubes-os.org/deb/r4.0/vm/dists/buster/InRelease  The following signatures were invalid: EXPKEYSIG A8F7A1DC99F29DAA Qubes OS Contrib Release 4 Signing Key

W: Some index files failed to download. They have been ignored, or old ones used instead.

Does anybody have the same problem with updating of the Debian 10 version?