diff --git a/docker/Dockerfile b/docker/Dockerfile
index 41e8956..512a497 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13.7
+FROM alpine:3.15.0
 
 EXPOSE 5353 8080
 
diff --git a/docker/ci/Dockerfile b/docker/ci/Dockerfile
index 28fb490..df5063a 100644
--- a/docker/ci/Dockerfile
+++ b/docker/ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13.7
+FROM alpine:3.15.0
 
 EXPOSE 5353 8080