diff --git a/README.md b/README.md
index 1300e7f..4766da8 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,10 @@ The list of parameters are:
   * `HUBITAT_TOPIC_PREFIXES`: MQTT topic used for Hubitat messages (default: "hubitat/")
   * `EXPOSE_LAST_SEEN`: Enable additional gauges exposing last seen timestamp for each metrics
   * `PARSE_MSG_PAYLOAD`: Enable parsing and metrics of the payload. (default: true)
+  * `PROMETHEUS_CERT`: Certificate to use for HTTPS. (default: None)
+  * `PROMETHEUS_CERT_KEY`: Key file for the certificate. Note: you must specify both _CERT and _CERT_KEY, otherwise it will use plain http. (default: None)
+  * `PROMETHEUS_CA`: File for a custom root CA to use. (default: None)
+  * `PROMETHEUS_CA_DIR`: Path to a directory with CA certificates to use. (default: None)
 
 ### Deployment
 
diff --git a/mqtt_exporter/main.py b/mqtt_exporter/main.py
index 010a980..b245722 100644
--- a/mqtt_exporter/main.py
+++ b/mqtt_exporter/main.py
@@ -538,7 +538,9 @@ def stop_request(signum, frame):
     signal.signal(signal.SIGINT, stop_request)
 
     # start prometheus server
-    start_http_server(settings.PROMETHEUS_PORT, settings.PROMETHEUS_ADDRESS)
+    start_http_server(settings.PROMETHEUS_PORT, settings.PROMETHEUS_ADDRESS, \
+        certfile = settings.PROMETHEUS_CERT, keyfile = settings.PROMETHEUS_CERT_KEY, \
+        client_cafile = settings.PROMETHEUS_CA, client_capath = settings.PROMETHEUS_CA_DIR)
 
     # define mqtt client
     client.on_connect = subscribe
diff --git a/mqtt_exporter/settings.py b/mqtt_exporter/settings.py
index ba40694..70f5567 100644
--- a/mqtt_exporter/settings.py
+++ b/mqtt_exporter/settings.py
@@ -28,5 +28,9 @@
 MQTT_TLS_NO_VERIFY = os.getenv("MQTT_TLS_NO_VERIFY", "False") == "True"
 PROMETHEUS_ADDRESS = os.getenv("PROMETHEUS_ADDRESS", "0.0.0.0")
 PROMETHEUS_PORT = int(os.getenv("PROMETHEUS_PORT", "9000"))
+PROMETHEUS_CERT = os.getenv("PROMETHEUS_CERT", None)
+PROMETHEUS_CERT_KEY = os.getenv("PROMETHEUS_CERT_KEY", None)
+PROMETHEUS_CA = os.getenv("PROMETHEUS_CA", None)
+PROMETHEUS_CA_DIR = os.getenv("PROMETHEUS_CA_DIR", None)
 
 KEEP_FULL_TOPIC = os.getenv("KEEP_FULL_TOPIC", "False") == "True"