Stranger Things will continue after season 5.

The Duffer brothers announced they are working on a new, untitled series set in the ‘Stranger Things universe. The Duffers will executive produce the new animated project via their Upside Down Pictures production banner. They will team up with Shawn Levy and Dan Cohen via 21 Laps and Eric Robles via Flying Bark Productions. The scripts and artwork have already been put together. Despite season 5 being the final one for the live-action series, the characters will live on in animated form and explore new lore in the world the Duffer brothers created.
“We’ve always dreamed of an animated Stranger Things in the vein of the Saturday morning cartoons that we grew up loving, and to see this dream realized has been absolutely thrilling.”
The Duffer Brothers