diff --git a/react-rust-postgres/backend/Dockerfile b/react-rust-postgres/backend/Dockerfile
index 0ca943b..fe7b0e1 100644
--- a/react-rust-postgres/backend/Dockerfile
+++ b/react-rust-postgres/backend/Dockerfile
@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.4
-FROM rust:buster AS base
+FROM rust:buster@sha256:f5da153862af6a25fcf49dde3cb19b5b513f78bc00e317eb64e898a66af2881d AS base
 
 ENV USER=root
 ENV ROCKET_ADDRESS=0.0.0.0