The 67-year-old country music icon said that the private pair will renew their wedding vows to commemorate the milestone occasion in 2016, reported E! online.
"We've talked about that-we might do it all over again! Another big wedding," she said.
Parton and Dean were married May 30, 1966 in Georgia, when the Grammy-winning singer was 20-year-old. They have no children together.
Parton said that the ceremony and party will likely to take place close at the couple's "big old plantation home" in Tennessee with family and friends.