diff --git a/platformio.ini b/platformio.ini
index c3cf579..0dc7777 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -14,7 +14,7 @@ board = esp32dev
 framework = arduino
 lib_deps = 
 	knolleary/PubSubClient@^2.8
-	bblanchon/ArduinoJson@^7.4.2
+	bblanchon/ArduinoJson@^6.21.4
 	claws/BH1750@^1.3.0
 	arduino-libraries/NTPClient@^3.2.1
 	adafruit/Adafruit ADS1X15@^2.4.2