bash if elif statement always prints first value

#!/bin/bash
config="update_release"
if [ "$config" == "update" ]; then
   schema_list="main_schemas"
elif [ "$config" == "update_release" ] ; then
   schema_list="release_schemas"
elif [ "$config" == "update_maintenance" ]; then
   schema_list="maintenance_schemas"
fi
echo $schema_list