Blueberries, do need to repot?

The blueberry plants I bought last year seem to be doing ok. I still have them in the pots they came in, would it be best to leave them for this year or repot now or neither? Thanks.

 

They look nice plants

We moved ours into 12" pots when that size, lasted for the following year and then moved them in 40ltr trugs with holes drill in the bottom, they got up to 6ft in size !
Ericaceous compost of course and use ideally use rain water but we had to use tap water with a couple of drops of cider vinegar per 6ltr watering can to drop its ph , best if you can measure its ph.

 

Thanks @ricky101 I've got some 12" pots, I've got rain water on hand, haven't got ericaceous compost but have got some irish peat moss (given to me) john innes no3, sand and other stuff so I can probably knock some up.

 

You might find these videos handy for pruning in future years.
https://www.youtube.com/user/Luberacouk/search?query=blueberries

 

I would definitely give them more room to grow. Those pots look tiny compared to the plant.

Additionally it helps during summer as bigger pots can store more moisture for your plants. You don't have to water them daily that way.