diff --git a/chrooted-sshd/Dockerfile b/chrooted-sshd/Dockerfile
index ebe86a5..96c0cd9 100644
--- a/chrooted-sshd/Dockerfile
+++ b/chrooted-sshd/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.21
 
 RUN apk add --no-cache openssh