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Legacy System Extension – Existing software on your system loaded a system extension signed by “Objective Development Software GmbH” which will be incompatible with a future version of macOS. Contact the developer for support.

Starting with macOS 10.15.4 the above “Legacy System Extension” message is shown when Little Snitch is installed.


Is there an update of Little Snitch that’s compatible with macOS 11 Big Sur?

Yes. The latest version 5 of Little Snitch is fully compatible with macOS 11 Big Sur. → Learn more…

Will I get the update for free?

If you have purchased a Little Snitch license after November 1, 2019, this license can also be used to register Little Snitch 5. If you purchased Little Snitch 4 before that date, you can get the upgrade at a reduced price.

Will Little Snitch 4 run on macOS 11 Big Sur?

Little Snitch 4 will not be loaded on macOS 11 Big Sur.

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