diff --git a/vendor/github.com/xenolf/lego/Dockerfile b/vendor/github.com/xenolf/lego/Dockerfile
index c039640768fe..84b88123deb2 100644
--- a/vendor/github.com/xenolf/lego/Dockerfile
+++ b/vendor/github.com/xenolf/lego/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.4
+FROM alpine:3.11.12
 
 ENV GOPATH /go