diff --git a/Dockerfile b/Dockerfile
index 9d13af8..bccfcb4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Copyright 2022 OWASP Core Rule Set Project
 # SPDX-License-Identifier: Apache-2.0
 
-FROM alpine:3.20.3@sha256:1e42bbe2508154c9126d48c2b8a75420c3544343bf86fd041fb7527e017a4b4a
+FROM alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
 
 RUN apk add --no-cache ca-certificates