diff --git a/roles/dev.nix b/roles/dev.nix
index c1cc8ee..a36198a 100644
--- a/roles/dev.nix
+++ b/roles/dev.nix
@@ -19,6 +19,7 @@ in {
       black
       pyyaml
       requests
+      black
     ]))
 
     mariadb-client