MOSCOW — A court on Tuesday extended the house arrest of Kirill S. Serebrennikov, the artistic director of the Gogol Center, whose case has raised alarms about repression of artistic freedom in Russia.

Mr. Serebrennikov is accused of embezzling government funds that had been allocated for one of his theatrical projects. The ruling means he will spend another three months under house arrest while awaiting trial.

Earlier this month, investigators reportedly elevated their accusations against Mr. Serebrennikov in a draft of an indictment, saying his theater company, Seventh Studio, had embezzled almost twice as much as they had initially suspected. He and his associates are now accused of stealing the ruble equivalent of $2.3 million.

The Ministry of Culture has been recognized as an injured party in the case, and has asked to be awarded the same sum as compensation if Mr. Serebrennikov is convicted.