diff --git a/scripts/install b/scripts/install
index 56447ad..a0b30fe 100644
--- a/scripts/install
+++ b/scripts/install
@@ -97,7 +97,7 @@ mkdir -p $final_path
 
 pushd $final_path
 
-PIPENV_VENV_IN_PROJECT="enabled" PIPENV_SKIP_LOCK=true  ynh_exec_warn_less python3 -m pipenv install jupyterlab==$jupyterlab_version jupyterhub notebook jupyterhub-ldapauthenticator --three
+PIPENV_VENV_IN_PROJECT="enabled" PIPENV_SKIP_LOCK=true  ynh_exec_warn_less python3 -m pipenv install jupyterlab==$jupyterlab_version jupyterhub notebook jupyterhub-ldapauthenticator pyzmq --three
 
 popd
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 862539d..3d92a49 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -114,7 +114,7 @@ then
 
 	pushd $final_path
 
-	PIPENV_VENV_IN_PROJECT="enabled" PIPENV_SKIP_LOCK=true  ynh_exec_warn_less python3 -m pipenv install jupyterlab==$jupyterlab_version jupyterhub notebook jupyterhub-ldapauthenticator
+	PIPENV_VENV_IN_PROJECT="enabled" PIPENV_SKIP_LOCK=true  ynh_exec_warn_less python3 -m pipenv install jupyterlab==$jupyterlab_version jupyterhub notebook jupyterhub-ldapauthenticator pyzmq
 
 	ynh_exec_warn_less python3 -m pipenv run jupyterhub upgrade-db