One of the sweetest deals going for individual savers – a government-backed, inflation-protected bond -- is about to get sweeter.

But already, there are signs the party won’t last forever.

Next month, the Treasury Department will reset the rate for its I Bonds. Since their rate is tied to the government inflation index which just came in at 8.5%, analysts say I Bonds are likely to rise to about 9.6% for the next six months, up from the current 7.12%.