diff --git a/Dockerfile b/Dockerfile
index 0f6db25..d29f7fa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20.3 as builder
+FROM alpine:3.21.0 as builder
 
 WORKDIR /go/src/github.com/systemli/prometheus-onion-service-exporter