During the Winter War it was proposed to modernise the T-100 with a more powerful armament, the 152 mm M-10 gun, able to destroy concrete structures, in particular dragon's teeth, a common anti-tank measure amongst Europe's fixed fortifications during World War II. A new turret to accommodate the 152 mm howitzer was implemented around March 1940. This new model was designated the T-100-Z. However this project was abandoned because the KV-1 and the 152 mm equipped KV-2 tanks were superior. In April 1940, the N°185 factory proposed a self-propelled gun (prototype 103) for coastal defence, based on the T-100 and armed with the B-13 130 mm naval gun installed in a rotating turret with three 7.62 mm machine-guns. This project never went beyond the drawing boards.