diff --git a/Dockerfile b/Dockerfile
index a19f9e8..2ed5719 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
-# renovate: datasource=repology depName=alpine_3_20/nut versioning=loose
-ENV NUT_VERSION="2.8.2-r0"
+# renovate: datasource=repology depName=alpine_3_21/nut versioning=loose
+ENV NUT_VERSION="2.8.2-r2"
 
 RUN apk add --no-cache nut="${NUT_VERSION}" shadow && \
     [ -d /etc/nut ] && find /etc/nut/ -type f -exec mv {} {}.sample \; || false && \