diff --git a/platformio.ini b/platformio.ini
index 7030b54f..7f0adeba 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -79,7 +79,7 @@ lib_deps_sensors =
     BSEC Software Library@1.5.1474
     https://github.com/ricki-z/SDS011.git
 lib_deps_basic =
-    ArduinoJson@^5.13.1
+    ArduinoJson@<6
     76@>=1.2.4 ; #76 Timezone by Jack Christensen
     274@>=2.3.4 ; #274 RTC by Michael Miller
     SimpleButton