diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 8830a864..7ce396ac 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -50,7 +50,7 @@ jobs:
       - name: Login to Harbor
         uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2.2.0
         with:
-          registry: harbor.stfc.ac.uk/datagateway
+          registry: ${{ secrets.HARBOR_URL }}
           username: ${{ secrets.HARBOR_USERNAME }}
           password: ${{ secrets.HARBOR_TOKEN }}
 
@@ -58,7 +58,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@818d4b7b91585d195f67373fd9cb0332e31a7175 # v4.6.0
         with:
-          images: harbor.stfc.ac.uk/datagateway/scigateway
+          images: ${{ secrets.HARBOR_URL }}/scigateway
 
       - name: Build and push Docker image to Harbor
         uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
diff --git a/Dockerfile b/Dockerfile
index ceeec36c..f1e9996f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Dockerfile to build and serve scigateway
 
 # Build stage
-FROM node:20.11-alpine3.18 as builder
+FROM node:20.11.1-alpine3.18@sha256:a02826c7340c37a29179152723190bcc3044f933c925f3c2d78abb20f794de3f as builder
 
 WORKDIR /scigateway-build
 
@@ -24,7 +24,7 @@ COPY docker/settings.json public/settings.json
 RUN yarn build
 
 # Run stage
-FROM httpd:2.4-alpine3.15
+FROM httpd:2.4.53-alpine3.15@sha256:4eb4177b9245c686696dd8120c79cd64b7632b27d890db4cad3b0e844ed737af
 
 WORKDIR /usr/local/apache2/htdocs