Various implementations include a system for adjusting the position of a seatbelt in a vehicle. The system includes a shoulder anchor, at least one sensor, and a processor. The shoulder anchor is for receiving a seatbelt. The shoulder anchor is movable relative to a seat disposed within the vehicle. The processor is in electrical communication with the sensor and a memory. The processor executes computer-readable instructions stored on the memory. The instructions cause the processor to receive sensor data from the sensor, determine whether the seatbelt is within an expected area on a person in the seat based on the received sensor data, and cause the shoulder anchor to move relative to the seat in response to the seatbelt being outside of the expected area on the person in the seat such that the seatbelt is moved into the expected area.