diff --git a/Dockerfile b/Dockerfile
index 2f4bdd5..6a77782 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.18.3
 RUN apk --no-cache add nginx \
  && rm -f /var/log/nginx/error.log \
  && ln -s /dev/stderr /var/log/nginx/error.log \