diff --git a/Dockerfile b/Dockerfile
index d3ed03e..7ab83bc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11 as builder
+FROM alpine:3.12 as builder
 
 ENV RESTY_VERSION=1.15.8.2
 ENV RESTY_SHA256_SUM=436b4e84d547a97a18cf7a2522daf819da8087b188468946b5a89c0dd1ca5d16