diff --git a/scripts/upgrade b/scripts/upgrade
index e2a14e0..52a2f53 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -173,6 +173,10 @@ else
 	ynh_permission_url --permission="admin" --auth_header=false
 fi
 
+# Support full Unicode in MySQL databases
+ynh_mysql_connect_as --user=$db_user --password="$db_pwd" --database=$db_name \
+    <<< "ALTER DATABASE $db_name CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;"
+
 #=================================================
 # CREATE DEDICATED USER
 #=================================================