The Matrix 4

While making the Matrix films, the Wachowskis told their close collaborators that at that time they had no intention of making another one after The Matrix Revolutions.[3][4][5][6] In February 2015, in interviews promoting Jupiter Ascending, Lilly Wachowski called a return to The Matrix a "particularly repelling idea in these times", noting the studios' tendency to green-light sequels, reboots, and adaptations over original material,[7] while Lana Wachowski, addressing rumors about a potential reboot, said they had not heard anything, but she believed the studio might be looking to replace them.[8]

In March 2017, The Hollywood Reporter wrote that Warner Bros. was in early stages of developing a relaunch of the franchise, with Zak Penn in talks to write a treatment, and interest in getting Michael B. Jordan attached to star. Neither of the Wachowskis were involved at that stage, although the studio had hoped for their blessing.[9] The notion of a reboot or remake was denounced by Penn, and ideas for stories set in the already established universe were explored, including, reportedly, a prequel film about a young Morpheus.[10][9][11] In March 2018, Penn said he is working on a revival of the franchise and teased the possibility of an expanded universe.[12] Penn clarified in October 2019 that he had been working on one of two Matrix projects at Warner Bros., and that his work was separate from the planned film.[13]

In May 2019, it was reported that Chad Stahelski, who worked as stunt coordinator on the previous Matrix films, claimed that at least one of the sisters were involved with a new Matrix film, although he was not sure whether they would be directing it.[14] Shortly later Stahelski walked back his comments, clarifying he was talking hypothetically and didn't mean to confirm their involvement.[15]

The film was officially announced by Warner Bros. on August 20, 2019. Lana Wachowski would return as sole director, with Reeves and Moss confirmed to reprise their roles. The script was written by Wachowski, Aleksandar Hemon and David Mitchell, who had previously written the series finale of Sense8 together.[16][17] The Wachowskis also previously directed the film adaptation of Mitchell's novel Cloud Atlas. Lilly Wachowski was not involved with the film due to work on the Showtime series Work in Progress, but gave her blessing to those involved to come up with a story even better than the original.[18] John Toll was hired to serve as cinematographer that same month. Toll had previously acted as cinematographer for the Wachowskis on Cloud Atlas, Jupiter Ascending and Sense8.[19] In October 2019, Yahya Abdul-Mateen II was cast in the film, with some sources speculating he would be playing a young Morpheus, while Neil Patrick Harris was added in an undisclosed role. Jada Pinkett Smith entered negotiations to reprise her role as Niobe, with Jessica Henwick entering negotiations to join in an undisclosed role.[20][21][22][23] Pinkett-Smith and Henwick would be confirmed in December, along with the additions of Jonathan Groff and Toby Onwumere.[24][25]

Keanu Reeves and Carrie-Anne Moss film a motorcycle scene in the Financial District of San Francisco under the direction of Lana Wachowski

In January 2020, Eréndira Ibarra was cast, with Priyanka Chopra entering final negotiations.[26][27] That same month, Lambert Wilson, who played The Merovingian in the sequels, revealed he was in negotiations to return, and Hugo Weaving, who starred in the franchise as Agent Smith, announced he would not be reprising his role in the film due to scheduling conflicts.[28][29] Chopra and Wilson's castings were confirmed in February, along with the additions of Andrew Caldwell, Brian J. Smith and Ellen Hollman.[2][30][31][32] Joe Pantoliano, who appeared in the original film as Cypher, expressed interest in reprising his role despite his character's death in the first installment and messaged Lana Wachowski about the possibility of bringing him back, but received no response from her.[33]

Under the code name "Project Ice Cream", the film began production in San Francisco on February 4, 2020.[30][34][35] Filming is also set to take place at Babelsberg Studio in Germany, and in Chicago.[36][35] Filming in San Francisco caused irritation amongst citizens and city workers after damage was inflicted to buildings and street lights. [37] As opposed to other productions, no second unit was needed during the action sequences as Wachowski directed all the scenes herself.[38]

On March 16, 2020, production on the film was halted due to the COVID-19 pandemic.[39] The production of the film is scheduled to continue on July 6, 2020.[40] Despite this, it was reported on June 24, 2020 that Keanu Reeves, Carrie-Anne Moss and Neil Patrick Harris have resumed filming of their scenes.[41]