diff --git a/gateway/include/Protocol_1.h b/gateway/include/Protocol_1.h
index f05e7f8..935904e 100644
--- a/gateway/include/Protocol_1.h
+++ b/gateway/include/Protocol_1.h
@@ -11,7 +11,7 @@ public:
     void fromJson(JsonObjectConst& rcSwitch, RCSwitch& rcDevice) override {
         unsigned int protocol = rcSwitch["protocol"];
         rcDevice.setProtocol(protocol);
-        char* group = rcSwitch["group"];
+        const char* group = rcSwitch["group"];
         int channel = rcSwitch["channel"];
         rcSwitch["state"] ? rcDevice.switchOn(group, channel) : rcDevice.switchOff(group, channel);
     }
diff --git a/gateway/platformio.ini b/gateway/platformio.ini
index 2e57c72..12f2a27 100644
--- a/gateway/platformio.ini
+++ b/gateway/platformio.ini
@@ -19,7 +19,7 @@ lib_extra_dirs =
     ../libraries
 lib_deps = 
 	sui77/rc-switch@^2.6.3
-	bblanchon/ArduinoJson@6.19.4
+	bblanchon/ArduinoJson@6.21.5
 	adafruit/Adafruit Unified Sensor@^1.1.4
 	adafruit/DHT sensor library@1.3.10
 	https://git.hodos.ro/arduino/lib_serial-reader.git@^1.0.0