diff --git a/clients/line-bot-messaging-api-client/src/main/java/com/linecorp/bot/messaging/model/NarrowcastProgressResponse.java b/clients/line-bot-messaging-api-client/src/main/java/com/linecorp/bot/messaging/model/NarrowcastProgressResponse.java
index 5d76d2c93..d96d8191e 100644
--- a/clients/line-bot-messaging-api-client/src/main/java/com/linecorp/bot/messaging/model/NarrowcastProgressResponse.java
+++ b/clients/line-bot-messaging-api-client/src/main/java/com/linecorp/bot/messaging/model/NarrowcastProgressResponse.java
@@ -61,7 +61,8 @@ public record NarrowcastProgressResponse(
      * Error summary. This is only included with a phase property value of failed. One of:
      * `1`: An internal error occurred. `2`: An error occurred because there
      * weren't enough recipients. `3`: A conflict error of requests occurs because a
-     * request that has already been accepted is retried.
+     * request that has already been accepted is retried. `4`: An audience of less than 50
+     * recipients is included as a condition of sending.
      */
     @JsonProperty("errorCode") Long errorCode,
     /**
diff --git a/line-openapi b/line-openapi
index e8fbce9ee..491e11809 160000
--- a/line-openapi
+++ b/line-openapi
@@ -1 +1 @@
-Subproject commit e8fbce9ee50b042df8aa452c20e6273693f3936e
+Subproject commit 491e11809ece8248dc079d60df40fff6096a094a