Credit ratings agency Moody's on Friday raised Greece's long-term issuer rating to "Caa2" from "Caa3" after eurozone governments extended a credit lifeline to the country.
Moody's also changed its outlook to "positive," up from "stable" previously, saying it saw signs that the heavily indebted country's economy was stabilizing.
It pointed to a mid-June agreement reached by Greece's creditors to relaunch an aid plan to the country, which had been blocked for months due to disagreements between eurozone countries - especially Germany - and the International Monetary Fund. The move reduces the specter of a short-term crisis, after eurozone governments agreed to give Greece a new credit lifeline of some 8.5 billion euros ($9.5 billion).
Moody's said it expected Greece's debt ratio to stabilize this year at 179 percent of GDP, adding that growth should return to the economy this year and next.
Greece returned to growth in the first quarter of 2017, with a 0.4 percent increase in GDP, according to figures revised upwards in early June.
"It is too early to conclude that economic growth will be durable," Moody's said. The IMF, which links financial aid to debt relief, has also signed an "agreement in principle" to allow immediate assistance that avoids a payment crisis in Athens this summer.