Its the largest annual increase in 13 years.
The cost of goods and services rose by 3.7 per cent in the year to September.
That's the largest annual increase in prices since October 2008, when the figure was four per cent.
CSO figures show the areas which saw the largest price increases in the year were transport, housing, water , electricity and gas.
There was a decrease in the cost of clothing and footwear.

Death Notices And A Fake Undertaker: Three-Year Sentence For Woman Behind Elaborate Death Hoax
Cannonball’s Naas Finale Helped Drive €781,000 Collection Boost For Jack and Jill
Proceeds Of Crime Reinvested In Communities As Kildare Secures Share Of €4.4m Fund
Plans Considered For 24-Hour Garda Station At Citywest Site
Come Back And Build At Home: Government Spends Half A Million To Woo Irish Tradespeople Abroad
Cocaine Worth €8m Found In Laois To Be Analysed At Celbridge Forensic Lab, As Man Due In Court Today
Pilot Found Guilty For His Role In Importing €8.4m Worth Of Cocaine Into Longford
CCPC Reminds Online Shoppers of Refund Rights As Fastway Jobs at Risk