This depends on the type of insurance you’ve taken out. For example if you are covering your mortgage then the amount will decrease in line with the amount with the loan. The monthly premium you pay will be the same each month.
If you have opted for RPI your premium and amount paid out will be in line with this each year. Please note that some insurers will only offer this for the first few years and if you decline it each year, it will no longer be available for you.