diff --git a/docker/Dockerfile b/docker/Dockerfile
index 039edac..b298682 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest AS builder
+FROM alpine:3.20 AS builder
 
 ENV MKDOCS_VERSION=1.1.0 \
     DOCS_DIRECTORY='/mkdocs' \