diff --git a/.final_builds/packages/ruby-4.0/index.yml b/.final_builds/packages/ruby-4.0/index.yml
new file mode 100644
index 0000000000..43d8c97063
--- /dev/null
+++ b/.final_builds/packages/ruby-4.0/index.yml
@@ -0,0 +1,10 @@
+builds:
+  1c57129111fddc1177f567ea243bb538a8087297eb916e61444e2fb27408b25d:
+    version: 1c57129111fddc1177f567ea243bb538a8087297eb916e61444e2fb27408b25d
+    blobstore_id: 35e7e099-6aa1-4def-5131-b4d40906479b
+    sha1: sha256:5962350916c57b180cc2453aa098d868ee17cef9610dabe8257fe1989779c29a
+  e33c6fb21a7a9e5cbf9df3cc9a23ee245e38227d64739abf95c7b9622866b0a8:
+    version: e33c6fb21a7a9e5cbf9df3cc9a23ee245e38227d64739abf95c7b9622866b0a8
+    blobstore_id: 514f174a-60a2-4e24-52cf-562f7217296d
+    sha1: sha256:7b55b7b74effac308b3fec4e2b915142686182d667445ab667ee02f426100700
+format-version: "2"
diff --git a/.final_builds/packages/rust-1-linux/index.yml b/.final_builds/packages/rust-1-linux/index.yml
index be264b293e..38cb3cabe3 100644
--- a/.final_builds/packages/rust-1-linux/index.yml
+++ b/.final_builds/packages/rust-1-linux/index.yml
@@ -1,6 +1,6 @@
 builds:
   9d04c35339688bfab109d4685fa9adad9d4a87050c73850e180d95172cbf13a0:
     version: 9d04c35339688bfab109d4685fa9adad9d4a87050c73850e180d95172cbf13a0
-    blobstore_id: 0b11647b-eb41-42c2-74cc-17a1471a6009
+    blobstore_id: 7a389dcc-7459-481e-6bb3-a9c0ff18930c
     sha1: sha256:495c7122dfe102d7f994e8c00dd0e149235870eda2e6f00468dac750f2802609
 format-version: "2"
diff --git a/.ruby-version b/.ruby-version
index 4d541eb209..d13e837c8e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.12
+4.0.6
diff --git a/jobs/blobstore_benchmark/spec b/jobs/blobstore_benchmark/spec
index 0a6218f3ef..4700e8ce60 100644
--- a/jobs/blobstore_benchmark/spec
+++ b/jobs/blobstore_benchmark/spec
@@ -16,7 +16,7 @@ templates:
 packages:
   - capi_utils
   - cloud_controller_ng
-  - ruby-3.3
+  - ruby-4.0
   - jemalloc
   - storage-cli
   - mariadb_connector_c
diff --git a/jobs/cc_deployment_updater/spec b/jobs/cc_deployment_updater/spec
index 2188d22e24..ae4c3152f3 100644
--- a/jobs/cc_deployment_updater/spec
+++ b/jobs/cc_deployment_updater/spec
@@ -42,7 +42,7 @@ packages:
   - libpq
   - jemalloc
   - mariadb_connector_c
-  - ruby-3.3
+  - ruby-4.0
 
 consumes:
 - name: database
diff --git a/jobs/cloud_controller_clock/spec b/jobs/cloud_controller_clock/spec
index 467ae784ad..34d816922c 100644
--- a/jobs/cloud_controller_clock/spec
+++ b/jobs/cloud_controller_clock/spec
@@ -43,7 +43,7 @@ packages:
   - libpq
   - jemalloc
   - mariadb_connector_c
-  - ruby-3.3
+  - ruby-4.0
 
 consumes:
 - name: database
diff --git a/jobs/cloud_controller_ng/spec b/jobs/cloud_controller_ng/spec
index 1c7c2a1981..ba7e1b0d25 100644
--- a/jobs/cloud_controller_ng/spec
+++ b/jobs/cloud_controller_ng/spec
@@ -77,7 +77,7 @@ packages:
   - libpq
   - jemalloc
   - mariadb_connector_c
-  - ruby-3.3
+  - ruby-4.0
 
 provides:
 - name: cloud_controller
diff --git a/jobs/cloud_controller_ng/templates/shutdown_drain.rb.erb b/jobs/cloud_controller_ng/templates/shutdown_drain.rb.erb
index 9e94ee56cd..f0cea2e8e6 100644
--- a/jobs/cloud_controller_ng/templates/shutdown_drain.rb.erb
+++ b/jobs/cloud_controller_ng/templates/shutdown_drain.rb.erb
@@ -1,4 +1,4 @@
-#!/var/vcap/packages/ruby-3.3/bin/ruby --disable-all
+#!/var/vcap/packages/ruby-4.0/bin/ruby --disable-all
 
 $LOAD_PATH.unshift('/var/vcap/packages/cloud_controller_ng/cloud_controller_ng/app')
 $LOAD_PATH.unshift('/var/vcap/packages/cloud_controller_ng/cloud_controller_ng/lib')
diff --git a/jobs/cloud_controller_worker/spec b/jobs/cloud_controller_worker/spec
index 68d3cbf849..855d6743db 100644
--- a/jobs/cloud_controller_worker/spec
+++ b/jobs/cloud_controller_worker/spec
@@ -51,7 +51,7 @@ packages:
   - libpq
   - jemalloc
   - mariadb_connector_c
-  - ruby-3.3
+  - ruby-4.0
 
 consumes:
 - name: database
diff --git a/jobs/cloud_controller_worker/templates/shutdown_drain.rb.erb b/jobs/cloud_controller_worker/templates/shutdown_drain.rb.erb
index 47019599bf..e0aeb5ee18 100644
--- a/jobs/cloud_controller_worker/templates/shutdown_drain.rb.erb
+++ b/jobs/cloud_controller_worker/templates/shutdown_drain.rb.erb
@@ -1,4 +1,4 @@
-#!/var/vcap/packages/ruby-3.3/bin/ruby --disable-all
+#!/var/vcap/packages/ruby-4.0/bin/ruby --disable-all
 
 $LOAD_PATH.unshift('/var/vcap/packages/cloud_controller_ng/cloud_controller_ng/app')
 $LOAD_PATH.unshift('/var/vcap/packages/cloud_controller_ng/cloud_controller_ng/lib')
diff --git a/jobs/rotate_cc_database_key/spec b/jobs/rotate_cc_database_key/spec
index a449614bce..ab716a81f1 100644
--- a/jobs/rotate_cc_database_key/spec
+++ b/jobs/rotate_cc_database_key/spec
@@ -16,7 +16,7 @@ packages:
   - libpq
   - jemalloc
   - mariadb_connector_c
-  - ruby-3.3
+  - ruby-4.0
 
 consumes:
 - name: cloud_controller_db
diff --git a/packages/cloud_controller_ng/packaging b/packages/cloud_controller_ng/packaging
index bdfec80841..9344859f97 100644
--- a/packages/cloud_controller_ng/packaging
+++ b/packages/cloud_controller_ng/packaging
@@ -1,7 +1,7 @@
 set -e -x
 
 # shellcheck disable=1090
-source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-3.3/bosh/compile.env"
+source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-4.0/bosh/compile.env"
 cp -a * ${BOSH_INSTALL_TARGET}
 cd ${BOSH_INSTALL_TARGET}/cloud_controller_ng
 
@@ -15,7 +15,8 @@ gem install --local vendor/cache/bundler-${BUNDLER_VERSION}.gem
 
 bundle config build.pg --with-pg-lib=$libpq_dir/lib --with-pg-include=$libpq_dir/include
 bundle config build.mysql2 --with-mysql-config=$mariadb_dir/bin/mariadb_config-wrapper.sh
-bosh_bundle_local --deployment
+bundle config set deployment true
+bosh_bundle_local
 
 # remove world-writable permissions on files if a gem has them
 chmod -R o-w ../gem_home
diff --git a/packages/cloud_controller_ng/spec b/packages/cloud_controller_ng/spec
index 06dc8affcd..b902fd5f1e 100644
--- a/packages/cloud_controller_ng/spec
+++ b/packages/cloud_controller_ng/spec
@@ -3,7 +3,7 @@ name: cloud_controller_ng
 dependencies:
 - libpq
 - mariadb_connector_c
-- ruby-3.3
+- ruby-4.0
 
 files:
 - cloud_controller_ng/{.ruby-version,Rakefile,Gemfile,Gemfile.lock}
diff --git a/packages/nginx_newrelic_plugin/packaging b/packages/nginx_newrelic_plugin/packaging
index bc40cad8d3..b3c9181188 100644
--- a/packages/nginx_newrelic_plugin/packaging
+++ b/packages/nginx_newrelic_plugin/packaging
@@ -1,7 +1,7 @@
 set -ex
 # shellcheck disable=1090
 
-source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-3.3/bosh/compile.env"
+source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-4.0/bosh/compile.env"
 
 echo "Installing nginx newrelic plugin"
 
@@ -9,5 +9,6 @@ cp -a nginx/newrelic_nginx_agent/* ${BOSH_INSTALL_TARGET}
 
 # Forcing an update to get BOSH to recompile this package
 pushd ${BOSH_INSTALL_TARGET}
-  bosh_bundle_local --deployment
+  bundle config set deployment true
+  bosh_bundle_local
 popd
diff --git a/packages/nginx_newrelic_plugin/spec b/packages/nginx_newrelic_plugin/spec
index 3464fec039..a648b0a865 100644
--- a/packages/nginx_newrelic_plugin/spec
+++ b/packages/nginx_newrelic_plugin/spec
@@ -1,6 +1,6 @@
 ---
 name: nginx_newrelic_plugin
 dependencies:
-- ruby-3.3
+- ruby-4.0
 files:
 - nginx/newrelic_nginx_agent-1.2.1.tar.gz
diff --git a/packages/ruby-3.3/spec.lock b/packages/ruby-3.3/spec.lock
deleted file mode 100644
index bb7de8030b..0000000000
--- a/packages/ruby-3.3/spec.lock
+++ /dev/null
@@ -1,4 +0,0 @@
-name: ruby-3.3
-fingerprint: 25a461ce712b47ca8115da90a28a33fb30e5956c5498a076601154f256e56625
-dependencies:
-- rust-1-linux
diff --git a/packages/ruby-4.0/spec.lock b/packages/ruby-4.0/spec.lock
new file mode 100644
index 0000000000..b01645d75c
--- /dev/null
+++ b/packages/ruby-4.0/spec.lock
@@ -0,0 +1,4 @@
+name: ruby-4.0
+fingerprint: e33c6fb21a7a9e5cbf9df3cc9a23ee245e38227d64739abf95c7b9622866b0a8
+dependencies:
+- rust-1-linux
diff --git a/shared_job_templates/ruby_version.sh.erb b/shared_job_templates/ruby_version.sh.erb
index 91f1996588..3e66af1d9d 100644
--- a/shared_job_templates/ruby_version.sh.erb
+++ b/shared_job_templates/ruby_version.sh.erb
@@ -1,5 +1,5 @@
 # shellcheck disable=1090
-source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-3.3/bosh/runtime.env"
+source "${BOSH_PACKAGES_DIR:-/var/vcap/packages}/ruby-4.0/bosh/runtime.env"
 
 CC_PACKAGE_DIR="${BOSH_PACKAGES_DIR:-/var/vcap/packages}/cloud_controller_ng"
 BUNDLER_VERSION=$(grep "BUNDLED WITH" ${CC_PACKAGE_DIR}/cloud_controller_ng/Gemfile.lock -A 1 | grep -v "BUNDLED" | awk '{print $1}')
diff --git a/spec/Gemfile b/spec/Gemfile
index 380009b536..f8b151ac64 100644
--- a/spec/Gemfile
+++ b/spec/Gemfile
@@ -3,6 +3,7 @@
 source 'https://rubygems.org'
 
 group :develop do
+  gem 'ostruct'
   gem 'rubocop'
   gem 'rubocop-capybara'
   gem 'rubocop-factory_bot'
diff --git a/spec/Gemfile.lock b/spec/Gemfile.lock
index fe4d376bc8..c4a580775d 100644
--- a/spec/Gemfile.lock
+++ b/spec/Gemfile.lock
@@ -8,6 +8,7 @@ GEM
     json (2.21.2)
     language_server-protocol (3.17.0.6)
     lint_roller (1.1.0)
+    ostruct (0.6.3)
     parallel (2.1.0)
     parser (3.3.12.0)
       ast (~> 2.4.1)
@@ -68,6 +69,7 @@ PLATFORMS
 
 DEPENDENCIES
   bosh-template
+  ostruct
   rspec
   rubocop
   rubocop-capybara