diff --git a/sonoff/xdrv_10_rules.ino b/sonoff/xdrv_10_rules.ino
index 8364c7864..ff0e3932a 100644
--- a/sonoff/xdrv_10_rules.ino
+++ b/sonoff/xdrv_10_rules.ino
@@ -685,7 +685,7 @@ void RulesTeleperiod(void)
 bool RulesMqttData(void)
 {
   bool serviced = false;
-  if (XdrvMailbox.data_len < 1 || XdrvMailbox.data_len > 128) {
+  if (XdrvMailbox.data_len < 1 || XdrvMailbox.data_len > 256) {
     return false;
   }
   String sTopic = XdrvMailbox.topic;
@@ -704,7 +704,7 @@ bool RulesMqttData(void)
       if (event_item.Key.length() == 0) {   //If did not specify Key
         value = sData;
       } else {      //If specified Key, need to parse Key/Value from JSON data
-        StaticJsonBuffer<400> jsonBuf;
+        StaticJsonBuffer<500> jsonBuf;
         JsonObject& jsonData = jsonBuf.parseObject(sData);
         String key1 = event_item.Key;
         String key2;