diff --git a/tljh/installer.py b/tljh/installer.py
index 5a9d7672..16aec494 100644
--- a/tljh/installer.py
+++ b/tljh/installer.py
@@ -283,6 +283,7 @@ def ensure_user_environment(user_requirements_txt_file):
     #
     with open(os.path.join(HERE, "requirements-hub-env.txt")) as f:
         jh_version_spec = [l for l in f if l.startswith("jupyterhub>=")][0]
+    jh_version_spec = ["jupyterhub==4.0.*"]
     conda.ensure_pip_packages(USER_ENV_PREFIX, [jh_version_spec], upgrade=True)
 
     # Install user environment extras for initial installations