diff --git a/scripts/install b/scripts/install
index 772298a..2c6e1e1 100755
--- a/scripts/install
+++ b/scripts/install
@@ -149,7 +149,7 @@ python3 -m venv /opt/yunohost/$app
 set +u;
 source /opt/yunohost/$app/bin/activate
 set -u;
-pip install radicale==$version python3-ldap
+pip install --no-cache-dir radicale==$version python3-ldap
 set +u;
 deactivate
 set -u;
diff --git a/scripts/upgrade b/scripts/upgrade
index 5c2aa9e..117b320 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -171,7 +171,7 @@ chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"
 
 chmod 666 -R $final_path/default_collections
-chmod 777 $final_path/default_collections $final_path/default_collections/USER
+chmod 755 $final_path/default_collections $final_path/default_collections/USER
 
 #=================================================
 # NGINX CONFIGURATION
@@ -232,17 +232,17 @@ then
 	set +u;
 	source /opt/yunohost/$app/bin/activate
 	set -u;
-	pip install radicale==$version python3-ldap
+	pip install --no-cache-dir radicale==$version python3-ldap
 	set +u;
 	deactivate
 	set -u;
 
 	# regex.py file is patched to fix the awful commit e807c3d35bea9cfcfcacac83b1b17d748ea15a39 that stop the reading of "rights" file after the first match.
-	mv "$final_path/regex.py" /opt/yunohost/$app/lib/python*/site-packages/radicale/rights/regex.py
+	# mv "$final_path/regex.py" /opt/yunohost/$app/lib/python*/site-packages/radicale/rights/regex.py
 fi
 
 chown radicale: -R /opt/yunohost/$app
-find /opt/yunohost/$app/ -type d -exec chmod 2755 {} \;
+find /opt/yunohost/$app/ -type d -exec chmod 755 {} \;
 find /opt/yunohost/$app/ -type f -exec chmod g+r,o+r {} \;
 
 #=================================================