If you live in the US you could buy Series I Savings Bonds from the government. They have a fixed rate which is set when you buy them (currently very low) but t

If you live in the US you could buy Series I Savings Bonds from the government. They have a fixed rate which is set when you buy them (currently very low) but they also return an additional rate that varies over time based on inflation. (There are also mutual funds out there like e.g. the Vanguard Inflation Protected Securities fund that are supposed to guard against inflation too.) In the long term, I would assume these will not give you anywhere near as good returns as other higher-risk investment options, but they might work for you depending on what you're looking for.