If you are self-employed, then no one will tell you (apart from maybe an accountant) that you need to put your prices up. If you think about it, most things increase in price year upon year with inflation so there is no reason why your business shouldn’t be able to do the same. If your prices were set quite low when you set up in order to attract business and gain experience, the following year you should look to increase your prices to make sure that you are getting the right money for the work you are doing.
It can be hard to explain to customers that you have increased your prices, but make sure you do, rather than just try and sneak a price increase in to their monthly, annual fees. Explain why you have had to increase your prices, e.g. price increase from suppliers, or now offering the client a better service which costs more to provide.