diff --git a/gui/default.nix b/gui/default.nix
index 4f395f3..92cdad9 100644
--- a/gui/default.nix
+++ b/gui/default.nix
@@ -12,7 +12,7 @@ let
     inherit (pkgs.python39Packages) pdm-pep517 setuptools setuptools-scm;
     inherit (pkgs.python39Packages)
       appdirs tzlocal more-itertools pytz sqlalchemy urlextract fastapi uvicorn
-      websockets uvloop httptools watchfiles;
+      websockets uvloop httptools watchfiles decorator;
     inherit (pkgs.python39Packages) lxml mistletoe logzero;
   };
   promnesiaService = {