diff --git a/docker/caddy/Dockerfile b/docker/caddy/Dockerfile
index a950524..423d303 100644
--- a/docker/caddy/Dockerfile
+++ b/docker/caddy/Dockerfile
@@ -4,7 +4,7 @@
 # https://github.com/caddyserver/caddy
 # https://github.com/caddyserver/forwardproxy
 
-FROM alpine:3.12
+FROM alpine:3.13
 LABEL maintainer="Teddysun <i@teddysun.com>"
 
 WORKDIR /root
diff --git a/docker/caddy/Dockerfile.architecture b/docker/caddy/Dockerfile.architecture
index 5b5af3f..4dcf1f7 100644
--- a/docker/caddy/Dockerfile.architecture
+++ b/docker/caddy/Dockerfile.architecture
@@ -4,7 +4,7 @@
 # https://github.com/caddyserver/caddy
 # https://github.com/caddyserver/forwardproxy
 
-FROM --platform=${TARGETPLATFORM} alpine:3.12
+FROM --platform=${TARGETPLATFORM} alpine:3.13
 LABEL maintainer="Teddysun <i@teddysun.com>"
 
 ARG TARGETPLATFORM