diff --git a/docker/Dockerfile b/docker/Dockerfile
index e05fcce..bc2033a 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 EXPOSE 5353 8080
 
diff --git a/docker/ci/Dockerfile b/docker/ci/Dockerfile
index b51d296..e4fbc9d 100644
--- a/docker/ci/Dockerfile
+++ b/docker/ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 EXPOSE 5353 8080