Raster layer - changing values in raster cells

I have a lot of cells in a raster layer (GeoTIFF) with a -9999 value in it. I would like to update that values to 0.

I mean, in vectorial layers would be something like: CASE WHEN band1=-9999 THEN 0 ELSE band1 END

Is this possible to do for raster layers in QGIS or any other GIS software?