The Scanning Imaging Absorption Spectrometer for Atmospheric CHartographY (SCIAMACHY) instrument is a UV-Visible-NearIR spectrometer operated on board the European Environmental Satellite (ENVISAT) from August 2002 to April 2012. In its limb viewing mode the instrument observed the Earth's atmosphere tangentially to the surface measuring the scattered solar light. At the University of Bremen, limb-scatter measurements from SCIAMACHY are currently used to retrieve stratospheric vertical distributions of several trace gases (O3, NO2, BrO, H2O) and aerosol optical parameters. In this presentation we analyse changes in the stratospheric composition as observed by the SCIAMACHY instrument during the ten years of its operation.