diff --git a/musl/Dockerfile b/musl/Dockerfile
index 9d7baa2..d9ae60b 100644
--- a/musl/Dockerfile
+++ b/musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.9 AS build
+FROM alpine AS build
 
 ARG PCRE_VERSION="8.43"
 ARG PCRE_CHECKSUM="0b8e7465dc5e98c757cc3650a20a7843ee4c3edf50aaf60bb33fd879690d2c73"