diff --git a/Dockerfile b/Dockerfile
index 2e71b97..1bd12e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginxinc/nginx-unprivileged:1.27-alpine
+FROM nginxinc/nginx-unprivileged:1.27-alpine@sha256:65e3e85dbaed8ba248841d9d58a899b6197106c23cb0ff1a132b7bfe0547e4c0
 COPY --chown=101:101 site/ /usr/share/nginx/html/
 USER 101
 EXPOSE 8080