diff --git a/platformio.ini b/platformio.ini
index 4ac0231..260c8fe 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -14,7 +14,7 @@ board = esp32dev
 framework = arduino
 lib_deps = 
 	adafruit/Adafruit NeoPixel@^1.6.0
-	wifwaf/MH-Z19@^1.5.2
 	squix78/ESP8266_SSD1306@^4.1.0
 	yiannisbourkelis/Uptime Library @ ^1.0.0
+	wifwaf/MH-Z19@^1.5.3
 monitor_speed = 115200
diff --git a/src/ebk_co2ampel.cpp b/src/ebk_co2ampel.cpp
index c04e729..beeda03 100644
--- a/src/ebk_co2ampel.cpp
+++ b/src/ebk_co2ampel.cpp
@@ -246,7 +246,7 @@ void calibrateCO2() {
   
   myMHZ19.setRange(5000);
   delay(500);
-  myMHZ19.calibrateZero();
+  myMHZ19.calibrate();
   delay(500);
   myMHZ19.autoCalibration(false);
   delay(500);