diff --git a/CHANGELOG.md b/CHANGELOG.md
index 483756d87..8c1717cc1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -105,6 +105,56 @@ This release changes the pinned API version to 2026-03-25.preview and contains a
   * Add support for event notifications `V1AccountSignalsIncludingDelinquencyCreatedEvent`, `V2CoreAccountSignalsFraudulentWebsiteReadyEvent`, and `V2SignalsAccountSignalFraudulentMerchantReadyEvent`
 * [#2040](https://github.com/stripe/stripe-php/pull/2040) Merge to private-preview
 
+## 20.0.0 - 2026-03-25
+
+This release changes the pinned API version to `2026-03-25.dahlia` and contains breaking changes (prefixed with ⚠️ below). There's also a [detailed migration guide](https://github.com/stripe/stripe-php/wiki/Migration-guide-for-v20) to simplify your upgrade process.
+
+Please review details for the breaking changes and alternatives in the [Stripe API changelog](https://docs.stripe.com/changelog/dahlia) before upgrading.
+
+* ⚠️ **Breaking change:** [#2038](https://github.com/stripe/stripe-php/pull/2038) Drop support for PHP < 7.2. This is also the **last major version to support PHP 7.2 and 7.3**. Please upgrade to 7.4+ before September 2026. See the [versioning policy](https://docs.stripe.com/sdks/versioning?lang=php#stripe-sdk-language-version-support-policy) for more information.
+* ⚠️ **Breaking change:** [#2042](https://github.com/stripe/stripe-php/pull/2042) Preserve null values in v2 JSON request bodies
+  - The SDK now preserves and sends `null` when set in V2 API metadata and params, enabling you to clear metadata entries and some unsettable properties for V2 APIs.
+  - ⚠️ The `Util::objectsToIds()` method now has a required `$serializeNull` parameter to indicate if null values set in the object should be output in the resulting hash. This is relevant for V2 POST APIs to let callers clear emptyable values.  
+* [#1917](https://github.com/stripe/stripe-php/pull/1917) Avoid using func_get_args
+* [#2011](https://github.com/stripe/stripe-php/pull/2011) Ensure that `previous_attributes` is always an instance of `StripeObject`
+* [#2033](https://github.com/stripe/stripe-php/pull/2033) Add runtime support for V2 int64 string-encoded fields
+  
+### ⚠️ Breaking changes due to changes in the Stripe API
+
+* [#2041](https://github.com/stripe/stripe-php/pull/2041) ⚠️ Throw an error when using the wrong webhook parsing method
+* Generated changes from [#2046](https://github.com/stripe/stripe-php/pull/2046), [#2044](https://github.com/stripe/stripe-php/pull/2044), [#2025](https://github.com/stripe/stripe-php/pull/2025)
+  * Add support for `upi_payments` on `Account.capabilities`, `Account.create().$params.capability`, and `Account.update().$params.capability`
+  * Add support for `upi` on `Charge.payment_method_details`, `Checkout.Session.payment_method_options`, `Checkout\Session.create().$params.payment_method_option`, `ConfirmationToken.create().$params.payment_method_datum`, `ConfirmationToken.payment_method_preview`, `Mandate.payment_method_details`, `PaymentAttemptRecord.payment_method_details`, `PaymentIntent.confirm().$params.payment_method_datum`, `PaymentIntent.confirm().$params.payment_method_option`, `PaymentIntent.create().$params.payment_method_datum`, `PaymentIntent.create().$params.payment_method_option`, `PaymentIntent.payment_method_options`, `PaymentIntent.update().$params.payment_method_datum`, `PaymentIntent.update().$params.payment_method_option`, `PaymentMethod.create().$params`, `PaymentMethodConfiguration.create().$params`, `PaymentMethodConfiguration.update().$params`, `PaymentMethodConfiguration`, `PaymentMethod`, `PaymentRecord.payment_method_details`, `SetupAttempt.payment_method_details`, `SetupIntent.confirm().$params.payment_method_datum`, `SetupIntent.confirm().$params.payment_method_option`, `SetupIntent.create().$params.payment_method_datum`, `SetupIntent.create().$params.payment_method_option`, `SetupIntent.payment_method_options`, `SetupIntent.update().$params.payment_method_datum`, and `SetupIntent.update().$params.payment_method_option`
+  * Add support for new value `tempo` on enums `Charge.payment_method_details.crypto.network`, `PaymentAttemptRecord.payment_method_details.crypto.network`, and `PaymentRecord.payment_method_details.crypto.network`
+  * Add support for `integration_identifier` on `Checkout.Session` and `Checkout\Session.create().$params`
+  * Add support for `crypto` on `Checkout\Session.create().$params.payment_method_option`
+  * Add support for `pending_invoice_item_interval` on `Checkout\Session.create().$params.subscription_datum`
+  * Add support for new values `elements`, `embedded_page`, `form`, and `hosted_page` on enum `Checkout.Session.ui_mode`
+  * Add support for new value `marine_carbon_removal` on enum `Climate.Supplier.removal_pathway`
+  * Add support for new value `upi` on enums `ConfirmationToken.payment_method_preview.type` and `PaymentMethod.type`
+  * Add support for `metadata` on `CreditNote.create().$params.line`, `CreditNote.preview().$params.line`, `CreditNote.preview_lines().$params.line`, and `CreditNoteLineItem`
+  * Add support for `quantity_decimal` on `Invoice.add_lines().$params.line`, `Invoice.create_preview().$params.invoice_item`, `Invoice.update_lines().$params.line`, `InvoiceItem.create().$params`, `InvoiceItem.update().$params`, `InvoiceItem`, `InvoiceLineItem.update().$params`, and `InvoiceLineItem`
+  * ⚠️ Add support for `level` on `Issuing\Authorization.create().$params.risk_assessment.card_testing_risk` and `Issuing\Authorization.create().$params.risk_assessment.merchant_dispute_risk`
+  * ⚠️ Remove support for `risk_level` on `Issuing\Authorization.create().$params.risk_assessment.card_testing_risk` and `Issuing\Authorization.create().$params.risk_assessment.merchant_dispute_risk`
+  * Add support for `lifecycle_controls` on `Issuing.Card` and `Issuing\Card.create().$params`
+  * ⚠️ Change type of `Issuing.Token.network_data.visa.card_reference_id` from `string` to `nullable(string)`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.brand` and `PaymentRecord.payment_method_details.card.brand` from `enum` to `nullable(enum)`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.exp_month` and `PaymentRecord.payment_method_details.card.exp_month` from `longInteger` to `nullable(longInteger)`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.exp_year` and `PaymentRecord.payment_method_details.card.exp_year` from `longInteger` to `nullable(longInteger)`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.funding` and `PaymentRecord.payment_method_details.card.funding` from `enum('credit'|'debit'|'prepaid'|'unknown')` to `nullable(enum('credit'|'debit'|'prepaid'|'unknown'))`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.last4` and `PaymentRecord.payment_method_details.card.last4` from `string` to `nullable(string)`
+  * ⚠️ Change type of `PaymentAttemptRecord.payment_method_details.card.moto` and `PaymentRecord.payment_method_details.card.moto` from `boolean` to `nullable(boolean)`
+  * Add support for `cryptogram`, `electronic_commerce_indicator`, `exemption_indicator_applied`, and `exemption_indicator` on `PaymentAttemptRecord.payment_method_details.card.three_d_secure` and `PaymentRecord.payment_method_details.card.three_d_secure`
+  * Add support for new value `upi` on enums `PaymentIntent.excluded_payment_method_types` and `SetupIntent.excluded_payment_method_types`
+  * Add support for `upi_handle_redirect_or_display_qr_code` on `PaymentIntent.next_action` and `SetupIntent.next_action`
+  * Add support for new value `upi` on enum `PaymentLink.payment_method_types`
+  * Add support for `recommended_action` and `signals` on `Radar.PaymentEvaluation`
+  * ⚠️ Remove support for `insights` on `Radar.PaymentEvaluation`
+  * Add support for new value `crypto_fingerprint` on enum `Radar.ValueList.item_type`
+  * Add support for new value `canceled_by_retention_policy` on enum `Subscription.cancellation_details.reason`
+  * ⚠️ Change type of `V2.Core.EventDestination.events_from` from `enum('other_accounts'|'self')` to `string`
+  * Add support for error code `service_period_coupon_with_metered_tiered_item_unsupported` on `Invoice.last_finalization_error`, `PaymentIntent.last_payment_error`, `SetupAttempt.setup_error`, `SetupIntent.last_setup_error`, and `StripeError`
+
 ## 19.5.0-alpha.4 - 2026-03-18
 * [#2035](https://github.com/stripe/stripe-php/pull/2035) Update generated code for private-preview
   * Add support for `simulate_crypto_deposit` test helper method on resource `PaymentIntent`
diff --git a/CODEGEN_VERSION b/CODEGEN_VERSION
index 786a2c1de..31a051624 100644
--- a/CODEGEN_VERSION
+++ b/CODEGEN_VERSION
@@ -1 +1 @@
-b0095e1dae0437fa60f0933a38f0914e8bba44ff
\ No newline at end of file
+50a0fd5b547588149f12172b5fae94ff530d1870
\ No newline at end of file