diff --git a/API_VERSION b/API_VERSION
index 0eb25f0f..dce12afc 100644
--- a/API_VERSION
+++ b/API_VERSION
@@ -1 +1 @@
-30548eb63bda9b0c49c54b3ff449525f9d83b761
\ No newline at end of file
+48d8ed18eca11eedce6fd54cd57fb83080d75acb
\ No newline at end of file
diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index f23e431d..7aa7a83a 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v2114
\ No newline at end of file
+v2115
\ No newline at end of file
diff --git a/README.md b/README.md
index 0b8f6d9f..e1cf23c1 100644
--- a/README.md
+++ b/README.md
@@ -346,6 +346,8 @@ Stripe has features in the [private preview phase](https://docs.stripe.com/relea
 
 ### Custom requests
 
+> This feature is only available from version 13 of this SDK.
+
 If you:
 
 - would like to send a request to an undocumented API (for example you are in a private beta)