The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
My 2011 iMac is currently operating on High Sierra. Is it possible to update to a newer OS, possible in increments?
iMac 21.5″, macOS 10.13
Nope' 10.13 High Sierra is the highest macOS that a Mid 2011 iMac can run.
You may want to consider installing Firefox 115 ESR. Mozilla says that they will provide "critical security updates" for it until September 2024. ("After this, no security updates will be provided and you are strongly encouraged to move to a supported version of macOS.")
Mozilla – Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release
+1 on Servants of Cats' excellent advice re FireFox ESR. We are using it without issue on a 2011 iMac 21.5" running hHigh Sierra and it does what we need.
can I update my 2011 iMac from High Sierrq
