diff --git a/docker/Dockerfile b/docker/Dockerfile
index e6c8f24..c6db9a6 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15.2
+FROM alpine:3.15.3
 
 EXPOSE 5353 8080
 
diff --git a/docker/ci/Dockerfile b/docker/ci/Dockerfile
index a9e2d4d..be530e2 100644
--- a/docker/ci/Dockerfile
+++ b/docker/ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15.2
+FROM alpine:3.15.3
 
 EXPOSE 5353 8080