diff --git a/host-radon.yml b/host-radon.yml
index a0a4f9a..25abe17 100644
--- a/host-radon.yml
+++ b/host-radon.yml
@@ -8,7 +8,7 @@
 
     data_dir: "/srv/data"
 
-    mosquitto_image: eclipse-mosquitto:2.0.20
+    mosquitto_image: eclipse-mosquitto:2.0.21
     mosquitto_data: "{{ data_dir }}/mosquitto"
 
     nodered_image: nodered/node-red:3.0.1-1-18