diff --git a/tljh/installer.py b/tljh/installer.py
index 926ffbfd..96b9880b 100644
--- a/tljh/installer.py
+++ b/tljh/installer.py
@@ -270,7 +270,9 @@ def ensure_user_environment(user_requirements_txt_file):
 
     # Install a matching jupyterhub version in the hub env
     #
-    jupyterhub_version = conda.get_conda_package_versions(HUB_ENV_PREFIX, "^jupyterhub$").get("jupyterhub")
+    jupyterhub_version = conda.get_conda_package_versions(
+        HUB_ENV_PREFIX, "^jupyterhub$"
+    ).get("jupyterhub")
     conda.ensure_pip_packages(USER_ENV_PREFIX, [f"jupyterhub=={jupyterhub_version}"])
 
     # Install user environment extras for initial installations