diff --git a/Dockerfile b/Dockerfile
index ab09558..c0703fe 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Use the Nginx image from Docker Hub
-FROM nginx:1.25.4-alpine
+FROM nginx:1.25.4-alpine@sha256:31bad00311cb5eeb8a6648beadcf67277a175da89989f14727420a80e2e76742
 
 # Copy the HTML file to the Nginx document root
 COPY index.html /usr/share/nginx/html