The Near Infrared Camera (NIRCam) instrument for NASA's James Webb Space Telescope (JWST) is one of the four
science instruments to be installed into the Integrated Science Instrument Module (ISIM) on JWST. NIRCam's
requirements include operation at 37 Kelvin to produce high resolution images in two wave bands encompassing the
range from 0.6 microns to 5 microns. In addition, NIRCam is to be used as a metrology instrument during the JWST
observatory commissioning on orbit, during the precise alignment of the observatory's multiple-segment primary
mirror. This paper will provide an update to the NIRCam Thermal subsystem design for stable operation at 37 Kelvin.