diff --git a/src/repoma/check_dev_files/jupyter.py b/src/repoma/check_dev_files/jupyter.py
index 8f213e5d..9061165a 100644
--- a/src/repoma/check_dev_files/jupyter.py
+++ b/src/repoma/check_dev_files/jupyter.py
@@ -14,6 +14,7 @@ def _update_dev_requirements() -> None:
         return
     hierarchy = ["jupyter", "dev"]
     dependencies = [
+        "isort",
         "jupyterlab",
         "jupyterlab-code-formatter",
         "jupyterlab-git",