diff --git a/scripts/install b/scripts/install
index a37e8de..888a4be 100644
--- a/scripts/install
+++ b/scripts/install
@@ -139,6 +139,9 @@ admin_mail=$(ynh_user_get_info $admin 'mail')
 #=================================================
 ynh_print_info --message="Building plugins..."
 
+mkdir -p "$final_path/include/plugins/build/.config/composer"
+export COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
+
 pushd "$final_path/include/plugins/build"
 	php make.php hydrate
 	php -dphar.readonly=0 make.php build auth-cas
diff --git a/scripts/upgrade b/scripts/upgrade
index c48c528..8e39797 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -82,14 +82,14 @@ ynh_abort_if_errors
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_print_info --message="Upgrading source files..."
-	
+
 	tmpdir="$(mktemp -d)"
 
 	mkdir $tmpdir/plugins
 	rsync -a "$final_path/include/plugins" "$tmpdir/."
 	rsync -a "$config_file" "$tmpdir/."
 	ynh_secure_remove --file="$final_path"
-	
+
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$final_path"
 	ynh_setup_source --dest_dir="$final_path/include/plugins/build" --source_id="core-plugins"
@@ -150,6 +150,8 @@ ynh_print_info --message="Building plugins..."
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
+	mkdir -p "$final_path/include/plugins/build/.config/composer"
+	export COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
 	pushd "$final_path/include/plugins/build"
 		php make.php hydrate
 		php -dphar.readonly=0 make.php build auth-cas