diff --git a/Dockerfile b/Dockerfile
index 4213c4f9..66b4fd10 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.19-alpine AS builder
+FROM golang:1.21-alpine AS builder
 RUN apk add --no-cache make git
 WORKDIR /go/src/github.com/mackerelio/mkr/
 COPY . .