diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index af023413..2fe900f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,16 +20,17 @@ on:
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
+    - uses: extractions/setup-just@v2
     - uses: actions/checkout@v3
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
         ruby-version:  3.1
     - name: Lint
-      run: bundle install && bundle exec rake rubocop
+      run: just lint
     - name: Build
       run: gem build stripe.gemspec
     - name: 'Upload Artifact'
@@ -40,12 +41,13 @@ jobs:
 
   test:
     name: Test (${{ matrix.ruby-version }})
-    # this is needed because our JRuby test version isnt supported on ubuntu-24 (which is now ubuntu-latest)
+    # this version of jruby isn't available in the new latest (24.04) so we have to pin (or update jruby)
     runs-on: ubuntu-22.04
     strategy:
       matrix:
         ruby-version: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, '3.3', jruby-9.4.0.0, truffleruby-head]
     steps:
+    - uses: extractions/setup-just@v2
     - uses: actions/checkout@v3
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
@@ -53,7 +55,7 @@ jobs:
         ruby-version: ${{ matrix.ruby-version }}
     - uses: stripe/openapi/actions/stripe-mock@master
     - name: test
-      run: make ci-test
+      run: just test typecheck
       env:
         GITHUB_TOKEN: ${{ secrets.github_token }}
 
@@ -64,7 +66,7 @@ jobs:
       startsWith(github.ref, 'refs/tags/v') &&
       endsWith(github.actor, '-stripe')
     needs: [build, test]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - name: Download all workflow run artifacts
       uses: actions/download-artifact@v4
diff --git a/Makefile b/Makefile
index cc7d150f..218187cf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# NOTE: this file is deprecated and slated for deletion; prefer using the equivalent `just` commands.
+
 .PHONY: update-version codegen-format test ci-test
 update-version:
 	@echo "$(VERSION)" > VERSION
diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index fc039b0b..59bdaaed 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v1450
\ No newline at end of file
+v1453
\ No newline at end of file
diff --git a/README.md b/README.md
index 121329af..a271ef82 100644
--- a/README.md
+++ b/README.md
@@ -364,19 +364,20 @@ New features and bug fixes are released on the latest major version of the Strip
 
 [Contribution guidelines for this project](CONTRIBUTING.md)
 
-The test suite depends on [stripe-mock], so make sure to fetch and run it from a
-background terminal ([stripe-mock's README][stripe-mock] also contains
-instructions for installing via Homebrew and other methods):
+The test suite depends on [stripe-mock], so make sure to fetch and run it from a background terminal ([stripe-mock's README][stripe-mock] also contains instructions for installing via Homebrew and other methods):
 
 ```sh
 go install github.com/stripe/stripe-mock@latest
 stripe-mock
 ```
 
+We use [just](https://github.com/casey/just) for common development tasks. You can install it or run the underlying commands directly (by copying them from the `justfile`). Common tasks include:
+
 Run all tests:
 
 ```sh
-bundle exec rake test
+just test
+# or: bundle exec rake test
 ```
 
 Run a single test suite:
@@ -394,13 +395,15 @@ bundle exec ruby -Ilib/ test/stripe/util_test.rb -n /should.convert.names.to.sym
 Run the linter:
 
 ```sh
-bundle exec rake rubocop
+just lint
+# or: bundle exec rubocop
 ```
 
 Update bundled CA certificates from the [Mozilla cURL release][curl]:
 
 ```sh
-bundle exec rake update_certs
+just update-certs
+# or: bundle exec rake update_certs
 ```
 
 Update the bundled [stripe-mock] by editing the version number found in
diff --git a/Rakefile b/Rakefile
index 44ae7a6c..b8646ef2 100644
--- a/Rakefile
+++ b/Rakefile
@@ -8,11 +8,6 @@ Rake::TestTask.new do |t|
   t.pattern = "./test/**/*_test.rb"
 end
 
-if RUBY_VERSION >= "2.7.0"
-  require "rubocop/rake_task"
-  RuboCop::RakeTask.new
-end
-
 desc "Update bundled certs"
 task :update_certs do
   require "net/http"
diff --git a/justfile b/justfile
new file mode 100644
index 00000000..803a3f07
--- /dev/null
+++ b/justfile
@@ -0,0 +1,43 @@
+set quiet
+
+import? '../sdk-codegen/utils.just'
+
+_default:
+    just --list --unsorted
+
+install *args:
+    bundle install {{ if is_dependency() == "true" {"--quiet"} else {""} }} {{ args }}
+
+# ⭐ run all unit tests
+test: install
+    bundle exec rake test
+
+# check linting / formatting status of files
+format-check *args: install
+    bundle exec rubocop {{ args }}
+alias lint-check := format-check
+
+# ⭐ check style & formatting for all files, fixing what we can
+lint: (format-check "--autocorrect")
+
+# NOTE: "-o /dev/null" is vital - rubocop has super noisy output and codegen will crash when formatting ruby if everything gets printed
+# so, we send all its output to the void
+# copy of `lint` with less output
+format: (format-check "-o /dev/null --autocorrect")
+
+update-certs: install
+    bundle exec rake update_certs
+
+# run sorbet to check type definitions
+typecheck: install
+    {{ if semver_matches(`ruby -e "puts RUBY_VERSION"`, ">=2.7") == "true" { \
+        "bundle exec srb tc" \
+    } else { \
+        "echo \"Ruby version < 2.7, skipping srb tc\"" \
+    } }}
+
+# called by tooling
+[private]
+update-version version:
+    echo "{{ version }}" > VERSION
+    perl -pi -e 's|VERSION = "[.\-\w\d]+"|VERSION = "{{ version }}"|' lib/stripe/version.rb
diff --git a/lib/stripe/resources/billing_portal/configuration.rb b/lib/stripe/resources/billing_portal/configuration.rb
index 25f349a2..98c4f269 100644
--- a/lib/stripe/resources/billing_portal/configuration.rb
+++ b/lib/stripe/resources/billing_portal/configuration.rb
@@ -202,7 +202,7 @@ module Stripe
             attr_accessor :enabled
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             attr_accessor :proration_behavior
 
             def initialize(
@@ -410,7 +410,7 @@ module Stripe
             attr_accessor :enabled
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             attr_accessor :proration_behavior
 
             def initialize(
diff --git a/lib/stripe/resources/financial_connections/transaction.rb b/lib/stripe/resources/financial_connections/transaction.rb
index 021e0e27..55be6c36 100644
--- a/lib/stripe/resources/financial_connections/transaction.rb
+++ b/lib/stripe/resources/financial_connections/transaction.rb
@@ -46,7 +46,7 @@ module Stripe
             @after = after
           end
         end
-        # The ID of the Stripe account whose transactions will be retrieved.
+        # The ID of the Financial Connections Account whose transactions will be retrieved.
         attr_accessor :account
         # A cursor for use in pagination. `ending_before` is an object ID that defines your place in the list. For instance, if you make a list request and receive 100 objects, starting with `obj_bar`, your subsequent call can include `ending_before=obj_bar` in order to fetch the previous page of the list.
         attr_accessor :ending_before
diff --git a/lib/stripe/services/billing_portal/configuration_service.rb b/lib/stripe/services/billing_portal/configuration_service.rb
index c0e9408a..5460ce61 100644
--- a/lib/stripe/services/billing_portal/configuration_service.rb
+++ b/lib/stripe/services/billing_portal/configuration_service.rb
@@ -100,7 +100,7 @@ module Stripe
             attr_accessor :enabled
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             attr_accessor :proration_behavior
 
             def initialize(
@@ -308,7 +308,7 @@ module Stripe
             attr_accessor :enabled
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             attr_accessor :proration_behavior
 
             def initialize(
diff --git a/lib/stripe/services/financial_connections/transaction_service.rb b/lib/stripe/services/financial_connections/transaction_service.rb
index 299a9a06..1e2c0085 100644
--- a/lib/stripe/services/financial_connections/transaction_service.rb
+++ b/lib/stripe/services/financial_connections/transaction_service.rb
@@ -31,7 +31,7 @@ module Stripe
             @after = after
           end
         end
-        # The ID of the Stripe account whose transactions will be retrieved.
+        # The ID of the Financial Connections Account whose transactions will be retrieved.
         attr_accessor :account
         # A cursor for use in pagination. `ending_before` is an object ID that defines your place in the list. For instance, if you make a list request and receive 100 objects, starting with `obj_bar`, your subsequent call can include `ending_before=obj_bar` in order to fetch the previous page of the list.
         attr_accessor :ending_before
diff --git a/rbi/stripe/resources/billing_portal/configuration.rbi b/rbi/stripe/resources/billing_portal/configuration.rbi
index f42700b6..7b5c3e2e 100644
--- a/rbi/stripe/resources/billing_portal/configuration.rbi
+++ b/rbi/stripe/resources/billing_portal/configuration.rbi
@@ -252,7 +252,7 @@ module Stripe
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             sig { returns(String) }
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             sig { returns(String) }
             attr_accessor :proration_behavior
             sig {
@@ -467,7 +467,7 @@ module Stripe
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             sig { returns(String) }
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             sig { returns(String) }
             attr_accessor :proration_behavior
             sig {
diff --git a/rbi/stripe/resources/financial_connections/transaction.rbi b/rbi/stripe/resources/financial_connections/transaction.rbi
index 19fdca64..a90eeaa9 100644
--- a/rbi/stripe/resources/financial_connections/transaction.rbi
+++ b/rbi/stripe/resources/financial_connections/transaction.rbi
@@ -74,7 +74,7 @@ module Stripe
           sig { params(after: String).void }
           def initialize(after: nil); end
         end
-        # The ID of the Stripe account whose transactions will be retrieved.
+        # The ID of the Financial Connections Account whose transactions will be retrieved.
         sig { returns(String) }
         attr_accessor :account
         # A cursor for use in pagination. `ending_before` is an object ID that defines your place in the list. For instance, if you make a list request and receive 100 objects, starting with `obj_bar`, your subsequent call can include `ending_before=obj_bar` in order to fetch the previous page of the list.
diff --git a/rbi/stripe/services/billing_portal/configuration_service.rbi b/rbi/stripe/services/billing_portal/configuration_service.rbi
index 1834536f..cf973f89 100644
--- a/rbi/stripe/services/billing_portal/configuration_service.rbi
+++ b/rbi/stripe/services/billing_portal/configuration_service.rbi
@@ -99,7 +99,7 @@ module Stripe
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             sig { returns(String) }
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             sig { returns(String) }
             attr_accessor :proration_behavior
             sig {
@@ -316,7 +316,7 @@ module Stripe
             # Whether to cancel subscriptions immediately or at the end of the billing period.
             sig { returns(String) }
             attr_accessor :mode
-            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. No prorations are generated when canceling a subscription at the end of its natural billing period.
+            # Whether to create prorations when canceling subscriptions. Possible values are `none` and `create_prorations`, which is only compatible with `mode=immediately`. Passing `always_invoice` will result in an error. No prorations are generated when canceling a subscription at the end of its natural billing period.
             sig { returns(String) }
             attr_accessor :proration_behavior
             sig {
diff --git a/rbi/stripe/services/financial_connections/transaction_service.rbi b/rbi/stripe/services/financial_connections/transaction_service.rbi
index 2e6baf36..9b7db702 100644
--- a/rbi/stripe/services/financial_connections/transaction_service.rbi
+++ b/rbi/stripe/services/financial_connections/transaction_service.rbi
@@ -29,7 +29,7 @@ module Stripe
           sig { params(after: String).void }
           def initialize(after: nil); end
         end
-        # The ID of the Stripe account whose transactions will be retrieved.
+        # The ID of the Financial Connections Account whose transactions will be retrieved.
         sig { returns(String) }
         attr_accessor :account
         # A cursor for use in pagination. `ending_before` is an object ID that defines your place in the list. For instance, if you make a list request and receive 100 objects, starting with `obj_bar`, your subsequent call can include `ending_before=obj_bar` in order to fetch the previous page of the list.