diff --git a/Dockerfile b/Dockerfile
index ffe9f5c..48adb26 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13.6
+FROM alpine:3.15.4
 
 RUN apk add --no-cache \
       openresolv iptables ip6tables iproute2 wireguard-tools \