That is Medicare part B, which is tied to revenue and costs, unlike SS and Medicare Part A.
This should be expected. Any increases tied to COLA will be minimal as we head into a deflationary time.
My father was suprised to see an increase this year and felt it was not necessary.
The problem is that too many people are dependent on SS as their ONLY source of income, expecting the government to cover their lack of planning for retirement. SS should be used as a supplement to retirement planning, not the foundation.