The Samsung Galaxy S6, S6 Edge, S6 Edge, S6 Edge+ and Galaxy Note 5 receive new updates
The Galaxy S6 series and the Galaxy Note 5 never made it past Android 7.0 Nougat, with Samsung dropping software support for the devices as of the September 2018 security patch. However, there are multiple reports of Samsung distributing new updates to the Galaxy S6, S6 Edge, S6 Edge+ and the Galaxy Note 5.
According to SamMobile, Samsung has already updated handsets in South Korea and has now moved onto their European counterparts. It is unclear what the updates for the devices bring, though. SamMobile states that the updates add 'security-related stabilisation code', even though the security patch update remains unchanged.
The website speculates that Samsung may have found a vulnerability that needed addressing, but we are unlikely to ever know unless someone delves into the code of the new builds. We would expect Samsung to roll the updates out to the Galaxy S6 series and the Galaxy Note 5 in Europe gradually, so it may be a few weeks before your handset receives a notification to download anything.