diff --git a/Dockerfile b/Dockerfile
index 002a5bf..181378d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13
+FROM alpine:3.15
 
 LABEL org.opencontainers.image.source="https://github.com/powerman/go-monolith-example"