diff --git a/platformio.ini b/platformio.ini
index 7525c57..29667e4 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -32,7 +32,7 @@ build_unflags =
 
 lib_deps =
     https://github.com/yubox-node-org/ESPAsyncWebServer
-    bblanchon/ArduinoJson @ ^6.21.2
+    bblanchon/ArduinoJson @ ^6.21.3
     https://github.com/bertmelis/espMqttClient.git#v1.4.4
     nrf24/RF24 @ ^1.4.7
     olikraus/U8g2 @ ^2.35.3