diff --git a/lib/ble/bluetooth.cpp b/lib/ble/bluetooth.cpp
index fd996498..e1e0758a 100644
--- a/lib/ble/bluetooth.cpp
+++ b/lib/ble/bluetooth.cpp
@@ -14,7 +14,7 @@ bool oldDeviceConnected = false;
 *************************************************************************/
 
 String getNotificationData() {
-    StaticJsonDocument<40> doc;   // notification capacity is reduced, only main value
+    JsonDocument doc;   // notification capacity is reduced, only main value
     int deviceType = sensors.getUARTDeviceTypeSelected();
     if (deviceType <= 3) {
         doc["P25"] = sensors.getPM25();  
@@ -27,7 +27,7 @@ String getNotificationData() {
 }
 
 String getSensorData() {
-    StaticJsonDocument<512> doc;
+    JsonDocument doc;
     
     doc["P1"] = sensors.getPM1();
     doc["P25"] = sensors.getPM25();
diff --git a/lib/configlib/ConfigApp.cpp b/lib/configlib/ConfigApp.cpp
index 69b08a20..9c3ad8e8 100644
--- a/lib/configlib/ConfigApp.cpp
+++ b/lib/configlib/ConfigApp.cpp
@@ -89,7 +89,7 @@ void reload() {
 }
 
 String getCurrentConfig() {
-    StaticJsonDocument<1000> doc;
+    JsonDocument doc;
     doc["wmac"] = (uint16_t)(chipid >> 32);  // chipid calculated in init
     doc["anaireid"] = getStationName();      // deviceId for Anaire cloud
     doc["wsta"] = wifi_connected;            // current wifi state
@@ -381,7 +381,7 @@ bool saveHassPassword(String passw) {
 }
 
 bool save(const char *json) {
-    StaticJsonDocument<1000> doc;
+    JsonDocument doc;
     auto error = deserializeJson(doc, json);
     if (error) {
         Serial.print(F("[E][CONF] deserialize Json failed with code "));
@@ -400,20 +400,20 @@ bool save(const char *json) {
     String act = doc["act"] | "";
 
     // if (doc.containsKey("dname")) return saveDeviceName(doc["dname"] | "");
-    if (doc.containsKey("stime")) return saveSampleTime(doc["stime"] | 0);
-    if (doc.containsKey("stype")) return saveSensorType(doc["stype"] | 0);
-    if (doc.containsKey("ifxdb")) return saveInfluxDb(doc["ifxdb"] | "", doc["ifxip"] | "", doc["ifxpt"] | 0);
-    if (doc.containsKey("pass") && doc.containsKey("ssid")) return saveWifi(doc["ssid"] | "", doc["pass"] | "");
-    if (doc.containsKey("ssid")) return saveSSID(doc["ssid"] | "");
-    if (doc.containsKey("lat")) return saveGeo(doc["lat"].as<double>(), doc["lon"].as<double>(), doc["geo"] | "");
-    if (doc.containsKey("toffset")) return saveTempOffset(doc["toffset"].as<float>());
-    if (doc.containsKey("altoffset")) return saveAltitudeOffset(doc["altoffset"].as<float>());
-    if (doc.containsKey("sealevel")) return saveSeaLevel(doc["sealevel"].as<float>());
-    if (doc.containsKey("hassip")) return saveHassIP(doc["hassip"] | "");
-    if (doc.containsKey("hasspt")) return saveHassPort(doc["hasspt"] | 1883);
-    if (doc.containsKey("hassusr")) return saveHassUser(doc["hassusr"] | "");
-    if (doc.containsKey("hasspsw")) return saveHassPassword(doc["hasspsw"] | "");
-    if (doc.containsKey("deepSleep")) return saveDeepSleep(doc["deepSleep"] | 0);
+    if (doc["stime"].is<int>()) return saveSampleTime(doc["stime"] | 0);
+    if (doc["stype"].is<int>()) return saveSensorType(doc["stype"] | 0);
+    if (doc["ifxdb"].is<int>()) return saveInfluxDb(doc["ifxdb"] | "", doc["ifxip"] | "", doc["ifxpt"] | 0);
+    if (doc["pass"].is<int>() && doc["ssid"].is<int>()) return saveWifi(doc["ssid"] | "", doc["pass"] | "");
+    if (doc["ssid"].is<int>()) return saveSSID(doc["ssid"] | "");
+    if (doc["lat"].is<int>()) return saveGeo(doc["lat"].as<double>(), doc["lon"].as<double>(), doc["geo"] | "");
+    if (doc["toffset"].is<int>()) return saveTempOffset(doc["toffset"].as<float>());
+    if (doc["altoffset"].is<int>()) return saveAltitudeOffset(doc["altoffset"].as<float>());
+    if (doc["sealevel"].is<int>()) return saveSeaLevel(doc["sealevel"].as<float>());
+    if (doc["hassip"].is<int>()) return saveHassIP(doc["hassip"] | "");
+    if (doc["hasspt"].is<int>()) return saveHassPort(doc["hasspt"] | 1883);
+    if (doc["hassusr"].is<int>()) return saveHassUser(doc["hassusr"] | "");
+    if (doc["hasspsw"].is<int>()) return saveHassPassword(doc["hasspsw"] | "");
+    if (doc["deepSleep"].is<int>()) return saveDeepSleep(doc["deepSleep"] | 0);
     
     // some actions with chopid validation (for security reasons)
     if (cmd == ((uint16_t)(chipid >> 32)) && act.length() > 0) {
@@ -434,18 +434,18 @@ bool save(const char *json) {
 }
 
 bool getTrackStatusValues(const char *json) {
-    StaticJsonDocument<200> doc;
+    JsonDocument doc;
     auto error = deserializeJson(doc, json);
     if (error) {
         Serial.print(F("[E][CONF] deserialize Json failed with code "));
         Serial.println(error.c_str());
         return false;
     }
-    if (doc.containsKey("spd")) track.spd = doc["spd"] | 0.0;
-    if (doc.containsKey("kms")) track.kms = doc["kms"] | 0.0;
-    if (doc.containsKey("hrs")) track.hrs = doc["hrs"] | 0;
-    if (doc.containsKey("min")) track.min = doc["min"] | 0;
-    if (doc.containsKey("seg")) track.seg = doc["seg"] | 0;
+    if (doc["spd"].is<int>()) track.spd = doc["spd"] | 0.0;
+    if (doc["kms"].is<int>()) track.kms = doc["kms"] | 0.0;
+    if (doc["hrs"].is<int>()) track.hrs = doc["hrs"] | 0;
+    if (doc["min"].is<int>()) track.min = doc["min"] | 0;
+    if (doc["seg"].is<int>()) track.seg = doc["seg"] | 0;
 
     return true;
 }
diff --git a/lib/wifi/cloud_anaire.cpp b/lib/wifi/cloud_anaire.cpp
index 786ca481..2c14bf23 100644
--- a/lib/wifi/cloud_anaire.cpp
+++ b/lib/wifi/cloud_anaire.cpp
@@ -20,7 +20,7 @@ void anairePublish() {
         float temp = sensors.getTemperature();
         if (temp == 0.0) temp = sensors.getCO2temp();
 
-        StaticJsonDocument<MQTT_BUFFER_SIZE> doc;
+        JsonDocument doc;
         char buffer[MQTT_BUFFER_SIZE];
 
         doc["id"] = getStationName();
diff --git a/lib/wifi/cloud_hass.cpp b/lib/wifi/cloud_hass.cpp
index 13b0b981..9396b417 100644
--- a/lib/wifi/cloud_hass.cpp
+++ b/lib/wifi/cloud_hass.cpp
@@ -34,7 +34,7 @@ void hassPubSensorPayload() {
     float temp = sensors.getTemperature();
     if (temp == 0.0) temp = sensors.getCO2temp();
     
-    StaticJsonDocument<MQTT_BUFFER_SIZE> doc;
+    JsonDocument doc;
     char buffer[MQTT_BUFFER_SIZE];
 
     doc["carbon_dioxide"] = String(sensors.getCO2());
@@ -68,14 +68,14 @@ void hassPubSensorPayload() {
 }
 
 bool publishDiscoveryPayload(String name, String dclass, String unit) {
-    StaticJsonDocument<MQTT_BUFFER_SIZE> doc;
+    JsonDocument doc;
     doc["name"] = getHostId()+name; // name of the entity
-    JsonObject device = doc.createNestedObject("device");
+    JsonObject device = doc["device"].to<JsonObject>();
     device["manufacturer"] = "CanAirIO";
     device["model"] = ""+String(FLAVOR);
     device["name"] = getHostId();  // name of the device
     device["sw_version"] = "v"+String(VERSION)+" rev"+String(REVISION);
-    JsonArray identifiers = device.createNestedArray("identifiers");
+    JsonArray identifiers = device["identifiers"].to<JsonArray>();
     identifiers.add(getHostId()); // name of the device
     doc["state_topic"] = getStateTopic();
     doc["state_class"] = "measurement",
diff --git a/platformio.ini b/platformio.ini
index 9aa818a8..cb664cf8 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -43,7 +43,7 @@ build_flags =
   ; -D DISABLE_CLI=1            # removed CLI module. Config via Bluetooth only
   ; -D ENABLE_OTA               # disable for memory saving. We have FOTA enable
 lib_deps = 
-  bblanchon/ArduinoJson @ 6.21.2
+  bblanchon/ArduinoJson @ 7.3.0
   hpsaturn/EasyPreferences @ 0.1.3
   ; hpsaturn/ESP32 Wifi CLI @ 0.3.1
   https://github.com/hpsaturn/esp32-wifi-cli.git#devel