diff --git a/code/platformio.ini b/code/platformio.ini
index faedc82e..36543b20 100644
--- a/code/platformio.ini
+++ b/code/platformio.ini
@@ -74,7 +74,7 @@ extra_scripts = extra_scripts.py
 #   Please note that we don't always use the latest version of a library.
 # ------------------------------------------------------------------------------
 lib_deps =
-    ArduinoJson
+    ArduinoJson@5.13.4
     https://github.com/marvinroger/async-mqtt-client#v0.8.1
     Brzo I2C
     https://github.com/xoseperez/debounceevent.git#2.0.5