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The rating for “Mary Poppins,” the beloved children’s musical about a nanny with magical powers that was released 60 years ago, has been raised to PG in Britain because of the use of “discriminatory language,” the British Board of Film Classification said.

The rating change follows a wave of recontextualizing and reclassifying of films from bygone eras for modern audiences amid shifting cultural norms and mores.

“Mary Poppins” includes two uses of an offensive racial slur to describe an Indigenous group in South Africa. It is first heard when Admiral Boom asks Michael, a child, if he is going on an adventure to defeat said group. Admiral Boom repeats the slur during a chimney sweeps dance sequence when he shouts that he is being attacked. The dancing figures he spots in the distance are not Black Africans, but white dancers with blackened faces from soot.

The film was originally rated “U,” for Universal, upon its release in 1964, and again in 2013 for a theatrical release, the B.B.F.C. said in a statement. When it was resubmitted in February for another theatrical release, it was reclassified as PG.

PG is the second-least severe of six ratings in Britain. The strictest is 18, which prohibits anyone under that age from renting, buying or seeing the film in movie theaters.

“We understand from our racism and discrimination research, and recent classification guidelines research, that a key concern for people, parents in particular, is the potential to expose children to discriminatory language” or behavior which they may find distressing or repeat without realizing the potential offense, a spokeswoman for the board said in a statement.