diff --git a/.dockerignore b/.dockerignore
index fc3c5ba6439..b45ad25aa2b 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,12 +1,21 @@
 .dockerignore
 .git
+.github
 .gitignore
 Dockerfile
 Jenkinsfile
 Procfile
 README.md
+app.json
+coverage
 docs
+features
 log
+node_modules
+package.json
+script
 spec
+startup.sh
 test
 tmp
+yarn.lock
diff --git a/Dockerfile b/Dockerfile
index bb387f8d44e..dde813008b4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,29 +1,26 @@
-ARG base_image=ghcr.io/alphagov/govuk-ruby-base:3.1.2
-ARG builder_image=ghcr.io/alphagov/govuk-ruby-builder:3.1.2
+ARG ruby_version=3.1.2
+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
 
-ENV BUNDLE_WITHOUT="development test webkit"
+FROM $builder_image AS builder
 
-RUN mkdir -p /app && ln -fs /tmp /app/tmp && ln -fs /tmp /home/app
-WORKDIR /app
-COPY Gemfile Gemfile.lock .ruby-version /app/
+WORKDIR $APP_HOME
+COPY Gemfile* .ruby-version ./
 RUN bundle install
-COPY . /app
-RUN bundle exec rails assets:precompile && rm -fr /app/log
+COPY . .
+RUN bootsnap precompile --gemfile .
+RUN rails assets:precompile && rm -fr log
 
 
 FROM $base_image
 
-ENV GOVUK_APP_NAME=smartanswers
+ENV GOVUK_APP_NAME=smart-answers
 
-RUN mkdir -p /app && ln -fs /tmp /app/tmp && ln -fs /tmp /home/app
-WORKDIR /app
-
-COPY --from=builder /usr/bin/node* /usr/bin/
-COPY --from=builder /usr/local/bundle/ /usr/local/bundle/
-COPY --from=builder /app ./
+WORKDIR $APP_HOME
+COPY --from=builder $BUNDLE_PATH $BUNDLE_PATH
+COPY --from=builder $BOOTSNAP_CACHE_DIR $BOOTSNAP_CACHE_DIR
+COPY --from=builder $APP_HOME .
 
 USER app
-
-CMD ["bundle", "exec", "puma"]
+CMD ["puma"]
diff --git a/Gemfile b/Gemfile
index 3cbc4d79062..015a65a0e83 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,7 @@ ruby File.read(".ruby-version").chomp
 gem "rails", "7.0.4"
 
 gem "ast"
+gem "bootsnap", require: false
 gem "gds-api-adapters"
 gem "gds_zendesk"
 gem "govspeak"
diff --git a/Gemfile.lock b/Gemfile.lock
index 393619b2ffe..a3b88b665f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -75,6 +75,8 @@ GEM
       rack (>= 0.9.0)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
+    bootsnap (1.15.0)
+      msgpack (~> 1.2)
     brakeman (5.2.3)
     builder (3.2.4)
     byebug (11.1.3)
@@ -218,6 +220,7 @@ GEM
       minitest (>= 4, < 6)
     mocha (2.0.2)
       ruby2_keywords (>= 0.0.5)
+    msgpack (1.6.0)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     net-imap (0.3.4)
@@ -430,6 +433,7 @@ DEPENDENCIES
   ast
   better_errors
   binding_of_caller
+  bootsnap
   byebug
   gds-api-adapters
   gds_zendesk
diff --git a/config/boot.rb b/config/boot.rb
index 282011619d9..997563c2aff 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,4 @@
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" # Set up gems listed in the Gemfile.
+require "bootsnap/setup"