diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 592b0e1..5334cb4 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.32.0"
+  ".": "1.33.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 33d3b46..49f0b44 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 118
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-ef726ad139fa29757029206ee08150434fc6c52005fec6d42c7d2bcd3aa7ab47.yml
-openapi_spec_hash: e622beb7c26f9b0dd641bd5c92735a5b
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-faf1f7c723d2762f09e9690ef2ceda58cb0a6ddacf1a79c3754871b90e7db0dc.yml
+openapi_spec_hash: 22269f85fae1ec920bdb0b32435a7aa8
 config_hash: dd4343ce95871032ef6e0735a4ca038c
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45bcef9..c4555cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.33.0 (2025-10-30)
+
+Full Changelog: [v1.32.0...v1.33.0](https://github.com/orbcorp/orb-go/compare/v1.32.0...v1.33.0)
+
+### Features
+
+* **api:** api update ([6f4242a](https://github.com/orbcorp/orb-go/commit/6f4242a9fa29367a8747086fba40e5419eefd400))
+
 ## 1.32.0 (2025-10-29)
 
 Full Changelog: [v1.31.0...v1.32.0](https://github.com/orbcorp/orb-go/compare/v1.31.0...v1.32.0)
diff --git a/README.md b/README.md
index c724d7a..469e03a 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Or to pin the version:
 <!-- x-release-please-start-version -->
 
 ```sh
-go get -u 'github.com/orbcorp/orb-go@v1.32.0'
+go get -u 'github.com/orbcorp/orb-go@v1.33.0'
 ```
 
 <!-- x-release-please-end -->
diff --git a/internal/version.go b/internal/version.go
index d10cb00..6d1a6f9 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "1.32.0" // x-release-please-version
+const PackageVersion = "1.33.0" // x-release-please-version
diff --git a/invoice.go b/invoice.go
index 6c470b5..44d40bb 100644
--- a/invoice.go
+++ b/invoice.go
@@ -49,12 +49,13 @@ func (r *InvoiceService) New(ctx context.Context, body InvoiceNewParams, opts ..
 	return
 }
 
-// This endpoint allows you to update the `metadata`, `net_terms`, and `due_date`
-// properties on an invoice. If you pass null for the metadata value, it will clear
-// any existing metadata for that invoice.
+// This endpoint allows you to update the `metadata`, `net_terms`, `due_date`, and
+// `invoice_date` properties on an invoice. If you pass null for the metadata
+// value, it will clear any existing metadata for that invoice.
 //
-// `metadata` can be modified regardless of invoice state. `net_terms` and
-// `due_date` can only be modified if the invoice is in a `draft` state.
+// `metadata` can be modified regardless of invoice state. `net_terms`, `due_date`,
+// and `invoice_date` can only be modified if the invoice is in a `draft` state.
+// `invoice_date` can only be modified for non-subscription invoices.
 func (r *InvoiceService) Update(ctx context.Context, invoiceID string, body InvoiceUpdateParams, opts ...option.RequestOption) (res *shared.Invoice, err error) {
 	opts = slices.Concat(r.Options, opts)
 	if invoiceID == "" {
@@ -1181,6 +1182,8 @@ type InvoiceUpdateParams struct {
 	// An optional custom due date for the invoice. If not set, the due date will be
 	// calculated based on the `net_terms` value.
 	DueDate param.Field[time.Time] `json:"due_date" format:"date-time"`
+	// The date of the invoice. Can only be modified for one-off draft invoices.
+	InvoiceDate param.Field[time.Time] `json:"invoice_date" format:"date-time"`
 	// User-specified key/value pairs for the resource. Individual keys can be removed
 	// by setting the value to `null`, and the entire metadata mapping can be cleared
 	// by setting `metadata` to `null`.
diff --git a/invoice_test.go b/invoice_test.go
index 16f0ce4..627a014 100644
--- a/invoice_test.go
+++ b/invoice_test.go
@@ -87,7 +87,8 @@ func TestInvoiceUpdateWithOptionalParams(t *testing.T) {
 		context.TODO(),
 		"invoice_id",
 		orb.InvoiceUpdateParams{
-			DueDate: orb.F(time.Now()),
+			DueDate:     orb.F(time.Now()),
+			InvoiceDate: orb.F(time.Now()),
 			Metadata: orb.F(map[string]string{
 				"foo": "string",
 			}),