diff --git a/src/book/templates/nmap.Dockerfile b/src/book/templates/nmap.Dockerfile
index 2c2d5f6..4a9a7d1 100644
--- a/src/book/templates/nmap.Dockerfile
+++ b/src/book/templates/nmap.Dockerfile
@@ -1,7 +1,7 @@
 # credits: https://github.com/instrumentisto/nmap-docker-image/blob/main/Dockerfile
 
 # https://hub.docker.com/_/alpine
-FROM alpine:3.20
+FROM alpine:3.22
 
 ARG nmap_ver=7.95
 ARG build_rev=4