We are revising our rules that deal with automatic cost-of- living increases to primary insurance amounts under title II of the Social Security Act (the Act). The revision is necessary because, beginning with the Consumer Price Index (CPI) for January 2007, the Bureau of Labor Statistics will publish the CPI to three decimal places. The CPI is currently published to one decimal place as is now reflected in our regulations. With this revision, our rules will conform to the change in the reporting of the CPI.