diff --git a/Dockerfile b/Dockerfile
index c1cd23e..ae79309 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:18-slim
+FROM node:18-slim@sha256:f9ab18e354e6855ae56ef2b290dd225c1e51a564f87584b9bd21dd651838830e
 WORKDIR /usr/src/app
 COPY package.json package-lock.json ./
 RUN npm ci --production