There has actually been very small to no movement in the CD rates over the last week. ... Any movement in the CD rates, especially in the CDs for 12 months or longer, would be primarily due to the fluctuations in the T-bill rate.
Rates for long term CDs (terms of 12 months and longer) are typically driven by the activity in the bond market. The bond market has been fairly active over the last couple of months, which is why you are seeing long term CD rates changing.