diff --git a/Dockerfile b/Dockerfile
index cde1efe..6fbc612 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG ALPINE_VERSION=3.20
+ARG ALPINE_VERSION=3.21
 
 FROM alpine:${ALPINE_VERSION}
 ARG ALPINE_VERSION