diff --git a/Dockerfile b/Dockerfile
index e0f92b3b..02bb3269 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.12.5-alpine AS build
+FROM golang:1.12.6-alpine AS build
 MAINTAINER shunsuke maeda <duck8823@gmail.com>
 
 RUN apk --update add --no-cache alpine-sdk ca-certificates \