diff --git a/matrix-synapse/values.yaml b/matrix-synapse/values.yaml
index 7d4042f..3661bab 100644
--- a/matrix-synapse/values.yaml
+++ b/matrix-synapse/values.yaml
@@ -794,7 +794,7 @@ volumePermissions:
   image:
     registry: docker.io
     repository: library/alpine
-    tag: 3.21.0
+    tag: 3.21.1
     pullPolicy: Always
 
     ## Optionally specify an array of imagePullSecrets.