diff --git a/platformio.ini b/platformio.ini
index 8eaac54..7a02943 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -8,7 +8,7 @@ lib_deps =
     Hash
     TaskScheduler
     SPIFFS
-    ArduinoJson
+    ArduinoJson@5.13.4
     ESPAsyncTCP
     ESP8266mDNS
     ESP Async WebServer