diff --git a/crates/clickhouse-cloud-api/clickhouse_cloud_openapi.json b/crates/clickhouse-cloud-api/clickhouse_cloud_openapi.json
index 07a5d38..08b3a8e 100644
--- a/crates/clickhouse-cloud-api/clickhouse_cloud_openapi.json
+++ b/crates/clickhouse-cloud-api/clickhouse_cloud_openapi.json
@@ -5,7 +5,7 @@
     "version": "1.0",
     "contact": {
       "name": "ClickHouse Support",
-      "url": "https://clickhouse.com/docs/en/cloud/manage/openapi?referrer=openapi-837009",
+      "url": "https://clickhouse.com/docs/en/cloud/manage/openapi?referrer=openapi-838082",
       "email": "support@clickhouse.com"
     }
   },
@@ -17069,6 +17069,15 @@
           }
         }
       },
+      "CustomPrivateDnsMapping": {
+        "properties": {
+          "privateDnsName": {
+            "description": "Custom private DNS name managed by the DNS controller. No Route53 hosted zone is required.",
+            "type": "string",
+            "example": "my-service.example.com"
+          }
+        }
+      },
       "CreateReversePrivateEndpoint": {
         "properties": {
           "description": {
@@ -17138,6 +17147,13 @@
               "null"
             ],
             "example": "projects/my-project/regions/us-central1/serviceAttachments/my-service"
+          },
+          "customPrivateDnsMappings": {
+            "type": "array",
+            "description": "Private Preview. Optional list of custom private DNS mappings. Each mapping points a private DNS name at this endpoint without creating a Route53 hosted zone.",
+            "items": {
+              "$ref": "#/components/schemas/CustomPrivateDnsMapping"
+            }
           }
         }
       },
@@ -17211,6 +17227,13 @@
             ],
             "example": "projects/my-project/regions/us-central1/serviceAttachments/my-service"
           },
+          "customPrivateDnsMappings": {
+            "type": "array",
+            "description": "Private Preview. Optional list of custom private DNS mappings. Each mapping points a private DNS name at this endpoint without creating a Route53 hosted zone.",
+            "items": {
+              "$ref": "#/components/schemas/CustomPrivateDnsMapping"
+            }
+          },
           "id": {
             "description": "Reverse private endpoint ID.",
             "type": "string",
diff --git a/crates/clickhouse-cloud-api/src/models.rs b/crates/clickhouse-cloud-api/src/models.rs
index 6851d87..38ac676 100644
--- a/crates/clickhouse-cloud-api/src/models.rs
+++ b/crates/clickhouse-cloud-api/src/models.rs
@@ -10128,6 +10128,8 @@ pub struct ClickStackUpdateDashboardRequest {
 /// `CreateReversePrivateEndpoint` from the ClickHouse Cloud API.
 #[derive(Debug, Clone, PartialEq, Default, Serialize, Deserialize)]
 pub struct CreateReversePrivateEndpoint {
+    #[serde(rename = "customPrivateDnsMappings", skip_serializing_if = "Option::is_none", default)]
+    pub custom_private_dns_mappings: Option<Vec<CustomPrivateDnsMapping>>,
     #[serde(default)]
     pub description: String,
     #[serde(rename = "gcpServiceAttachment", skip_serializing_if = "Option::is_none", default)]
@@ -10167,6 +10169,13 @@ pub struct CurrentScaling {
     pub effective_min_replicas: i64,
 }
 
+/// `CustomPrivateDnsMapping` from the ClickHouse Cloud API.
+#[derive(Debug, Clone, PartialEq, Default, Serialize, Deserialize)]
+pub struct CustomPrivateDnsMapping {
+    #[serde(rename = "privateDnsName", skip_serializing_if = "Option::is_none", default)]
+    pub private_dns_name: Option<String>,
+}
+
 /// `GcpBackupBucket` from the ClickHouse Cloud API.
 #[derive(Debug, Clone, PartialEq, Default, Serialize, Deserialize)]
 pub struct GcpBackupBucket {
@@ -10665,6 +10674,8 @@ pub struct ResourceTagsV1 {
 /// `ReversePrivateEndpoint` from the ClickHouse Cloud API.
 #[derive(Debug, Clone, PartialEq, Default, Serialize, Deserialize)]
 pub struct ReversePrivateEndpoint {
+    #[serde(rename = "customPrivateDnsMappings", skip_serializing_if = "Option::is_none", default)]
+    pub custom_private_dns_mappings: Option<Vec<CustomPrivateDnsMapping>>,
     #[serde(default)]
     pub description: String,
     #[serde(rename = "dnsNames", default)]
diff --git a/crates/clickhouse-cloud-api/tests/spec_coverage_test.rs b/crates/clickhouse-cloud-api/tests/spec_coverage_test.rs
index 54e4484..95edd31 100644
--- a/crates/clickhouse-cloud-api/tests/spec_coverage_test.rs
+++ b/crates/clickhouse-cloud-api/tests/spec_coverage_test.rs
@@ -385,6 +385,18 @@ const OPTIONALITY_EXEMPTIONS: &[(&str, &str)] = &[
     // `Option<ApiKeyHashData>` lets callers omit it and have the API
     // generate the key as the spec's response description implies.
     ("ApiKeyPostRequest", "hashData"),
+    // `customPrivateDnsMappings` is documented as optional ("Private Preview.
+    // Optional list of custom private DNS mappings.") but the description
+    // heuristic keys on the literal "Optional" prefix, so the "Private
+    // Preview." lead-in causes it to be inferred as required. The field has
+    // no `required` array and the API treats it as opt-in.
+    ("CreateReversePrivateEndpoint", "customPrivateDnsMappings"),
+    ("ReversePrivateEndpoint", "customPrivateDnsMappings"),
+    // `CustomPrivateDnsMapping` is a single-field schema with no `required`
+    // array. The mapping object itself is only meaningful when supplied
+    // inside the (optional) `customPrivateDnsMappings` list, and the API
+    // treats the name as optional within that context.
+    ("CustomPrivateDnsMapping", "privateDnsName"),
 ];
 
 fn assert_field_optionality(spec: &Value) {