diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 2bcd9de..c3ba87b 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -26,7 +26,7 @@ jobs:
   build-and-publish-image:
     if: github.event_name == 'workflow_dispatch' || startsWith(github.ref_name, 'v')
     name: Build and publish image
-    uses: alphagov/govuk-infrastructure/.github/workflows/build-and-push-image.yml@main
+    uses: alphagov/govuk-infrastructure/.github/workflows/build-and-push-multiarch-image.yml@main
     with:
       gitRef: ${{ inputs.gitRef || github.ref_name }}
     permissions:
diff --git a/Dockerfile b/Dockerfile
index dbb4eeb..cc09f68 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ ARG ruby_version=3.3.1
 ARG base_image=ghcr.io/alphagov/govuk-ruby-base:$ruby_version
 ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:$ruby_version
 
-FROM $builder_image AS builder
+FROM --platform=$TARGETPLATFORM $builder_image AS builder
 
 WORKDIR $APP_HOME
 COPY Gemfile* .ruby-version ./
@@ -10,7 +10,7 @@ RUN bundle install
 COPY . .
 RUN rails assets:precompile && rm -fr log
 
-FROM $base_image
+FROM --platform=$TARGETPLATFORM $base_image
 
 ENV GOVUK_APP_NAME=search-v2-evaluator