Flatpak says that the current runtime is out of date.
$ flatpak update
Looking for updates…
Info: org.freedesktop.Platform//20.08 is end-of-life, with reason:
org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Applications using this runtime:
fyi.zoey.TeX-Match
Info: org.freedesktop.Platform.VAAPI.Intel//20.08 is end-of-life, with reason:
org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Info: org.freedesktop.Platform.GL.default//20.08 is end-of-life, with reason:
org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Nothing to do.
Flatpak says that the current runtime is out of date.