diff --git a/stacks/sensor/compose.yaml b/stacks/sensor/compose.yaml
index 5c43c110..56297e10 100644
--- a/stacks/sensor/compose.yaml
+++ b/stacks/sensor/compose.yaml
@@ -199,7 +199,7 @@ services:
   # typed by hand still labels the host correctly.
   # ---------------------------------------------------------------------------
   alloy:
-    image: grafana/alloy:v1.20.1@sha256:2aa2099af76c0098d4af7a4d6e48f86cb66dc1a000222ad927a1c67c6542d13f
+    image: grafana/alloy:v1.21.3@sha256:8ab871206bd2d8f89277f53abffee5f452a293980788d52f85fa183a87a505a4
     container_name: sensor-alloy
     restart: unless-stopped
     logging: *default-logging