diff --git a/telegram_esp32.ino b/telegram_esp32.ino
index 2e708c9..6fee3de 100644
--- a/telegram_esp32.ino
+++ b/telegram_esp32.ino
@@ -208,6 +208,8 @@ void setup() {
   // Connect to Wi-Fi
   WiFi.mode(WIFI_STA);
   WiFi.begin(ssid, password);
+  client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // set the Telegram SSL cert
+
   while (WiFi.status() != WL_CONNECTED) {
     delay(1000);
     Serial.println("Connecting to WiFi..");