Almost a year later, on April 23, 2017, creator Thomas Astruc confirmed that the season was still a possibility. On May 17, during a fan live event in Los Angeles, Jeremy Zag confirmed that they were real.
Zag posted on Instagram on January 22, 2018, that the crew was working on Season 4 and Season 5. He wrote that it will include "new powers, new outfits, new kwamis, [and] new heroes!"
In August 2019, it was announced that Gloob would become a partner of the series, starting from this season onward.
On August 23, 2019, it was confirmed by Lindalee Rose that season 4 will feature: "new outfits, new power-ups, new multi-Miraculous-combo powers, jaw dropping new akumatized villains, secret siblings, and who wins and who loses in the Adrienette vs Lukanette ship".
On September 6, 2019 Gloob confirmed that they will co-produce seasons 4 & 5.
On September 7, 2019 Jeremy Zag confirmed that seasons 4 & 5 are on its way! The two seasons are greenlighted and in productions.
On December 8, 2019, Thomas Astruc confirmed that the new season will have episodes that are the "equivalent impacts of Cat Blanc". The Île aux Cygnes, an island that made its first appearance in the second issue of Miraculous Adventures, was also confirmed to be visited.
On January 10, 2020, it was announced that SAMG Animation is no longer co-producer of the show.
On February 8, 2020, it was announced by Winny that studios were already working on the animation of Season 4.
On March 13, 2020 it was announced that season 4 will premiere on Disney Channel Russia sometime in 2021.