diff --git a/openapi/spec3.beta.sdk.json b/openapi/spec3.beta.sdk.json
index 2bcfdd2e..11a08869 100644
--- a/openapi/spec3.beta.sdk.json
+++ b/openapi/spec3.beta.sdk.json
@@ -2919,6 +2919,9 @@
           {
             "$ref": "#/components/schemas/connect_collection_transfer"
           },
+          {
+            "$ref": "#/components/schemas/customer_cash_balance_transaction"
+          },
           {
             "$ref": "#/components/schemas/dispute"
           },
@@ -9747,7 +9750,10 @@
         "x-stripeResource": {
           "class_name": "CustomerCashBalanceTransaction",
           "has_collection_class": true,
-          "in_package": ""
+          "in_package": "",
+          "polymorphic_groups": [
+            "balance_transaction_source"
+          ]
         }
       },
       "customer_session": {
diff --git a/openapi/spec3.beta.sdk.yaml b/openapi/spec3.beta.sdk.yaml
index 7cdc301d..1ca6a016 100644
--- a/openapi/spec3.beta.sdk.yaml
+++ b/openapi/spec3.beta.sdk.yaml
@@ -2836,6 +2836,7 @@ components:
         - $ref: '#/components/schemas/application_fee'
         - $ref: '#/components/schemas/charge'
         - $ref: '#/components/schemas/connect_collection_transfer'
+        - $ref: '#/components/schemas/customer_cash_balance_transaction'
         - $ref: '#/components/schemas/dispute'
         - $ref: '#/components/schemas/fee_refund'
         - $ref: '#/components/schemas/issuing.authorization'
@@ -9362,6 +9363,8 @@ components:
         class_name: CustomerCashBalanceTransaction
         has_collection_class: true
         in_package: ''
+        polymorphic_groups:
+          - balance_transaction_source
     customer_session:
       description: >-
         A customer session allows you to grant client access to Stripe's
diff --git a/openapi/spec3.json b/openapi/spec3.json
index 8aa3e351..7f5fb6e0 100644
--- a/openapi/spec3.json
+++ b/openapi/spec3.json
@@ -2186,6 +2186,9 @@
               {
                 "$ref": "#/components/schemas/connect_collection_transfer"
               },
+              {
+                "$ref": "#/components/schemas/customer_cash_balance_transaction"
+              },
               {
                 "$ref": "#/components/schemas/dispute"
               },
@@ -2239,6 +2242,9 @@
                 {
                   "$ref": "#/components/schemas/connect_collection_transfer"
                 },
+                {
+                  "$ref": "#/components/schemas/customer_cash_balance_transaction"
+                },
                 {
                   "$ref": "#/components/schemas/dispute"
                 },
diff --git a/openapi/spec3.sdk.json b/openapi/spec3.sdk.json
index 10369ef0..5f7c4b58 100644
--- a/openapi/spec3.sdk.json
+++ b/openapi/spec3.sdk.json
@@ -2840,6 +2840,9 @@
           {
             "$ref": "#/components/schemas/connect_collection_transfer"
           },
+          {
+            "$ref": "#/components/schemas/customer_cash_balance_transaction"
+          },
           {
             "$ref": "#/components/schemas/dispute"
           },
@@ -8858,7 +8861,10 @@
         "x-stripeResource": {
           "class_name": "CustomerCashBalanceTransaction",
           "has_collection_class": true,
-          "in_package": ""
+          "in_package": "",
+          "polymorphic_groups": [
+            "balance_transaction_source"
+          ]
         }
       },
       "customer_tax": {
diff --git a/openapi/spec3.sdk.yaml b/openapi/spec3.sdk.yaml
index 9ed40ed4..0cd0e7ab 100644
--- a/openapi/spec3.sdk.yaml
+++ b/openapi/spec3.sdk.yaml
@@ -2762,6 +2762,7 @@ components:
         - $ref: '#/components/schemas/application_fee'
         - $ref: '#/components/schemas/charge'
         - $ref: '#/components/schemas/connect_collection_transfer'
+        - $ref: '#/components/schemas/customer_cash_balance_transaction'
         - $ref: '#/components/schemas/dispute'
         - $ref: '#/components/schemas/fee_refund'
         - $ref: '#/components/schemas/issuing.authorization'
@@ -8539,6 +8540,8 @@ components:
         class_name: CustomerCashBalanceTransaction
         has_collection_class: true
         in_package: ''
+        polymorphic_groups:
+          - balance_transaction_source
     customer_tax:
       description: ''
       properties:
diff --git a/openapi/spec3.yaml b/openapi/spec3.yaml
index b5d5b848..69916bf3 100644
--- a/openapi/spec3.yaml
+++ b/openapi/spec3.yaml
@@ -2199,6 +2199,7 @@ components:
             - $ref: '#/components/schemas/application_fee'
             - $ref: '#/components/schemas/charge'
             - $ref: '#/components/schemas/connect_collection_transfer'
+            - $ref: '#/components/schemas/customer_cash_balance_transaction'
             - $ref: '#/components/schemas/dispute'
             - $ref: '#/components/schemas/fee_refund'
             - $ref: '#/components/schemas/issuing.authorization'
@@ -2219,6 +2220,7 @@ components:
               - $ref: '#/components/schemas/application_fee'
               - $ref: '#/components/schemas/charge'
               - $ref: '#/components/schemas/connect_collection_transfer'
+              - $ref: '#/components/schemas/customer_cash_balance_transaction'
               - $ref: '#/components/schemas/dispute'
               - $ref: '#/components/schemas/fee_refund'
               - $ref: '#/components/schemas/issuing.authorization'