diff --git a/shell.nix b/shell.nix
index 52a99ee..fae4627 100644
--- a/shell.nix
+++ b/shell.nix
@@ -28,6 +28,7 @@ devshell.mkShell {
         python-escpos
         pycups
         caldav
+        python-dotenv
       ]
     ))
   ];