diff --git a/Dockerfile b/Dockerfile
index d8f4ecd..ccf57e2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13.4 as builder
+FROM alpine:3.13.5 as builder
 
 WORKDIR /go/src/github.com/systemli/prometheus-etherpad-exporter