diff --git a/ftl-build/Dockerfile b/ftl-build/Dockerfile
index 137621b..83aaeca 100644
--- a/ftl-build/Dockerfile
+++ b/ftl-build/Dockerfile
@@ -1,4 +1,4 @@
-ARG CONTAINER="alpine:3.21"
+ARG CONTAINER="alpine:3.21.1"
 FROM ${CONTAINER} AS builder
 
 ARG TARGETPLATFORM