Pints in Heron and Brearley pubs are 5p more expensive from today.
The additional charge will also extend to packaged beers and ciders and minerals, and wine prices will rise by 50p per bottle.
The move comes as a result of several supplier cost increases, according to the brewery.
It's added it remains committed to keeping prices as low as possible and to investing in its venues and people to create the best possible customer experience.
Steam Packet sailings delayed tonight
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PPE Medpro put into liquidation
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Part of TT course closed tomorrow
A section of the TT course in the west will close for much of tomorrow.
Carl Cox backs cancer charity's TT fundraising auction
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Business appeal over thousands in unpaid bills
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Pharmacy plans for former IOM Bank
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Appeal after wood from van damages car
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Island part of union data breach investigation
The Island's information commissioner is taking part in an investigation into a huge data breach at a trade union.
