diff --git a/scripts/upgrade b/scripts/upgrade
index 9e98d69..985956c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -24,7 +24,7 @@ sudo chown radicale:radicale -R /opt/yunohost/radicale
 # Upgrade pip packages
 sudo rm -Rf /opt/yunohost/radicale
 sudo virtualenv /opt/yunohost/radicale
-sudo /opt/yunohost/radicale/bin/pip install radicale==1.0 python-ldap
+sudo bash -c 'source /opt/yunohost/radicale/bin/activate && pip install radicale python-ldap --upgrade'
 
 # Radicale configuration
 sudo cp ../conf/config /etc/radicale/