  In 2002, 2004, and 2017 we conducted high precision CCD photometry
observations of the eclipsing binary system AS~Cam. By the analysis of the
light curves from 1967 to 2017 (our data + data from the literature) we
obtained photometric elements of the system and found the change of the
system's orbital eccentricity by $\Delta e=0.03 \pm 0.01$. This change can
indicate that there is a third companion in the system in a highly inclined
orbit with respect to the orbital plane of the central binary, and its
gravitational influence may cause the discrepancy between the observed and
theoretical apsidal motion rates of AS~Cam.
