The NFC North side beat the Super Bowl champions 19-17, despite losing two of their wide receivers to injuries during the first half.
The head coach told reporters: "Our defense played strong throughout the game, and the last 10 plays were their biggest challenge. Our offense was struggling to generate consistent production, but then came on strong at the end of the game.
"The locker room atmosphere afterward was incredible, there was a lot of enthusiasm. Our team took a step in a lot of ways, emotionally, mentally, physically, and more important, in the win column.
"There were a number of challenges that we knew if we overcame we'd definitely take a step in the area of overall improvement as a team, and we accomplished that."
The Packers host the Cleveland Browns this weekend.