Indoor service in bars and restaurants in SLOT XO the Republic of Ireland can resume on Monday 26 July for the fully vaccinated or those who have recovered from Covid-19.
President Michael D Higgins signed the legislation on Wednesday.
Under the new guidelines, customers will not be subject to time limits and closing time will be set at 23.30.
Up to six people will be allowed to sit at tables which must be kept one metre apart, RTÉ has reported.
The Irish government is developing an app to allow hospitality business owners to check customers' EU Digital Covid Certificates.
Last week, more than two million people in the Republic of Ireland got their certificates, which contain QR codes, by email and post.
Taoiseach (Irish PM) Micheál Martin said the Irish vaccination programme is rolling out "very effectively".
However, he said people need to be vigilant in the coming weeks, adding: "We have all got to adhere to the guidelines no matter how tired we are of this pandemic".