diff --git a/stacks/soc/compose.yaml b/stacks/soc/compose.yaml
index 62a82180..8e9493de 100644
--- a/stacks/soc/compose.yaml
+++ b/stacks/soc/compose.yaml
@@ -652,7 +652,7 @@ services:
   # ---------------------------------------------------------------------------
   alloy:
     <<: *service-defaults
-    image: grafana/alloy:v1.20.1@sha256:2aa2099af76c0098d4af7a4d6e48f86cb66dc1a000222ad927a1c67c6542d13f
+    image: grafana/alloy:v1.21.3@sha256:8ab871206bd2d8f89277f53abffee5f452a293980788d52f85fa183a87a505a4
     container_name: soc-alloy
     pids_limit: 1024
     # A bound, not a measurement: re-derive from process_resident_memory_bytes