diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index a75e729f5..b87b42e0c 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v216
\ No newline at end of file
+v217
\ No newline at end of file
diff --git a/stripe/api_resources/account.py b/stripe/api_resources/account.py
index 196c16484..ce23fba63 100644
--- a/stripe/api_resources/account.py
+++ b/stripe/api_resources/account.py
@@ -13,15 +13,15 @@
 from stripe.six.moves.urllib.parse import quote_plus
 
 
+@nested_resource_class_methods(
+    "external_account",
+    operations=["create", "retrieve", "update", "delete", "list"],
+)
 @nested_resource_class_methods(
     "capability",
     operations=["retrieve", "update", "list"],
     resource_plural="capabilities",
 )
-@nested_resource_class_methods(
-    "external_account",
-    operations=["create", "retrieve", "update", "delete", "list"],
-)
 @nested_resource_class_methods("login_link", operations=["create"])
 @nested_resource_class_methods(
     "person",
diff --git a/stripe/api_resources/customer.py b/stripe/api_resources/customer.py
index 655c95688..979341c8b 100644
--- a/stripe/api_resources/customer.py
+++ b/stripe/api_resources/customer.py
@@ -14,6 +14,10 @@
 
 
 @test_helpers
+@nested_resource_class_methods(
+    "source",
+    operations=["create", "retrieve", "update", "delete", "list"],
+)
 @nested_resource_class_methods(
     "balance_transaction",
     operations=["create", "retrieve", "update", "list"],
@@ -22,10 +26,6 @@
     "cash_balance_transaction",
     operations=["retrieve", "list"],
 )
-@nested_resource_class_methods(
-    "source",
-    operations=["create", "retrieve", "update", "delete", "list"],
-)
 @nested_resource_class_methods(
     "tax_id",
     operations=["create", "retrieve", "delete", "list"],
diff --git a/stripe/api_resources/quote.py b/stripe/api_resources/quote.py
index c7a6d11d5..21e2fc7f0 100644
--- a/stripe/api_resources/quote.py
+++ b/stripe/api_resources/quote.py
@@ -228,6 +228,37 @@ def list_lines(self, idempotency_key=None, **params):
             params=params,
         )
 
+    @classmethod
+    def _cls_mark_stale_quote(
+        cls,
+        quote,
+        api_key=None,
+        stripe_version=None,
+        stripe_account=None,
+        **params
+    ):
+        return cls._static_request(
+            "post",
+            "/v1/quotes/{quote}/mark_stale".format(
+                quote=util.sanitize_id(quote)
+            ),
+            api_key=api_key,
+            stripe_version=stripe_version,
+            stripe_account=stripe_account,
+            params=params,
+        )
+
+    @util.class_method_variant("_cls_mark_stale_quote")
+    def mark_stale_quote(self, idempotency_key=None, **params):
+        return self._request(
+            "post",
+            "/v1/quotes/{quote}/mark_stale".format(
+                quote=util.sanitize_id(self.get("id"))
+            ),
+            idempotency_key=idempotency_key,
+            params=params,
+        )
+
     @classmethod
     def _cls_preview_invoice_lines(
         cls,