diff --git a/scripts/install b/scripts/install
index d6ca80d..329a0d9 100644
--- a/scripts/install
+++ b/scripts/install
@@ -54,7 +54,8 @@ ynh_script_progression --message="Setting up source files..."
 ynh_setup_source --dest_dir="$install_dir/build"
 
 chown -R $app:www-data "$install_dir"
-chmod -R 755 "$install_dir"
+chmod -R o-rwx "$install_dir"
+chown -R $app:www-data "$install_dir"
 
 #=================================================
 # INSTALL APP
@@ -78,7 +79,7 @@ popd
 mkdir -p $install_dir/frontend
 mv $install_dir/build/frontend/target/dist/* $install_dir/frontend
 chown -R $app:www-data $install_dir/frontend
-chmod -R 755 $install_dir/frontend
+chmod -R 750 $install_dir/frontend
 
 ynh_script_progression --message="Building backend..." --weight=5
 
diff --git a/scripts/upgrade b/scripts/upgrade
index bee1b89..7b6c620 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -58,8 +58,8 @@ then
 
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$install_dir/build"
+	chmod -R o-rwx "$install_dir"
 	chown -R $app:www-data "$install_dir"
-	chmod -R 755 "$install_dir"
 
 	ynh_script_progression --message="Building frontend..." --weight=5