Paderborn clinched their second successive promotion to seal a Bundesliga return, despite losing 3-1 to Dynamo Dresden on the final day of the season.
Steffen Baumgart's men travelled to the DDV-Stadion with a one-point advantage over third-placed Union Berlin, while Cologne were already confirmed as 2. Bundesliga champions.
Philipp Klement gave Paderborn the lead after 10 minutes in Dresden with his 16th goal of the season, but Baris Atik quickly replied. The Turkish midfielder then scored twice either side of the break to complete his hat-trick and give Union the chance to steal promotion with victory over VfL Bochum.