The Argentina striker left the bench early as an unused substitute last weekend after Gervinho's late double earned Parma a shock 3-3 away draw.
And Juve boss Massimiliano Allegri said: "He had an attitude that is not appropriate, he understood that. Case closed.
"He apologised, as it was right to do from a clever boy like him, to whom the club has given important responsibility – the number 10 jersey and the captain's armband when [Giorgio] Chiellini is not available."
Allegri admitted Dybala has faced a tough, new challenge this season following the £105million summer arrival of Cristiano Ronaldo from Real Madrid.
Former Milan chief Allegri said: "His position on the field has not changed, only the characteristics of those who play alongside him have.
"The difference is that last year there was [Gonzalo] Higuain and [Mario] Mandzukic; this year there is Ronaldo and Mandzukic.
"He touches the same amount of balls, has the same opportunities. I do not tell him to be a full-back.
"Sometimes you try to find things that do not exist. I laugh when I read certain things but people like to fill their mouths. I listen and enjoy it."
But Allegri confirmed Dybala's Parma petulance is now behind him – and the 25-year-old might even skipper Juve at Sassuolo in Serie A tomorrow.
Champions Juventus are nine points clear at the top, while Sassuolo are a respectable 11th.
Allegri initially reacted to Dybala's late antics against Parma by joking the ex-Palermo star was just a cold person.
But he was reportedly far angrier than he revealed publicly – until Dybala apologised.
Allegri said: "Tomorrow Dybala or [Federico] Bernardeschi will play. If Dybala plays, he could be the captain but I have to decide."
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