diff --git a/api/openapi.yaml b/api/openapi.yaml
index 67afdbb0..35253011 100644
--- a/api/openapi.yaml
+++ b/api/openapi.yaml
@@ -6610,7 +6610,6 @@ components:
       - id
       - media
       - owner
-      - priority
       - segmentCount
       - text
       - time
@@ -6782,7 +6781,6 @@ components:
       - from
       - id
       - owner
-      - priority
       - segmentCount
       - tag
       - text
diff --git a/bandwidth.yml b/bandwidth.yml
index 5362a7c5..c4b1fb2b 100644
--- a/bandwidth.yml
+++ b/bandwidth.yml
@@ -1862,7 +1862,6 @@ components:
         - from
         - text
         - media
-        - priority
     messageDeliveredCallback:
       description: Message Delivered Callback
       type: object
@@ -2035,7 +2034,6 @@ components:
         - from
         - text
         - tag
-        - priority
     callbackMethodEnum:
       type: string
       nullable: true
diff --git a/docs/MessageFailedCallbackMessage.md b/docs/MessageFailedCallbackMessage.md
index 3ddfbc1b..8b628350 100644
--- a/docs/MessageFailedCallbackMessage.md
+++ b/docs/MessageFailedCallbackMessage.md
@@ -19,7 +19,7 @@ Message Failed Callback Message Schema
 |**text** | **String** |  |  |
 |**tag** | **String** |  |  |
 |**media** | **List<URI>** |  |  [optional] |
-|**priority** | **PriorityEnum** |  |  |
+|**priority** | **PriorityEnum** |  |  [optional] |
 
 
 
diff --git a/docs/MessageSendingCallbackMessage.md b/docs/MessageSendingCallbackMessage.md
index 7611cfb0..1d2bf5ae 100644
--- a/docs/MessageSendingCallbackMessage.md
+++ b/docs/MessageSendingCallbackMessage.md
@@ -19,7 +19,7 @@ Message Sending Callback Message Schema
 |**text** | **String** |  |  |
 |**tag** | **String** |  |  [optional] |
 |**media** | **List<URI>** |  |  |
-|**priority** | **PriorityEnum** |  |  |
+|**priority** | **PriorityEnum** |  |  [optional] |
 
 
 
diff --git a/src/main/java/com/bandwidth/sdk/model/MessageFailedCallbackMessage.java b/src/main/java/com/bandwidth/sdk/model/MessageFailedCallbackMessage.java
index 12dc3384..fe2e8fc3 100644
--- a/src/main/java/com/bandwidth/sdk/model/MessageFailedCallbackMessage.java
+++ b/src/main/java/com/bandwidth/sdk/model/MessageFailedCallbackMessage.java
@@ -344,7 +344,7 @@ public MessageFailedCallbackMessage priority(PriorityEnum priority) {
    * Get priority
    * @return priority
   **/
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   public PriorityEnum getPriority() {
     return priority;
   }
@@ -492,7 +492,6 @@ private String toIndentedString(Object o) {
     openapiRequiredFields.add("from");
     openapiRequiredFields.add("text");
     openapiRequiredFields.add("tag");
-    openapiRequiredFields.add("priority");
   }
 
  /**
@@ -545,8 +544,10 @@ public static void validateJsonElement(JsonElement jsonElement) throws IOExcepti
       if (jsonObj.get("media") != null && !jsonObj.get("media").isJsonNull() && !jsonObj.get("media").isJsonArray()) {
         throw new IllegalArgumentException(String.format("Expected the field `media` to be an array in the JSON string but got `%s`", jsonObj.get("media").toString()));
       }
-      // validate the required field `priority`
-      PriorityEnum.validateJsonElement(jsonObj.get("priority"));
+      // validate the optional field `priority`
+      if (jsonObj.get("priority") != null && !jsonObj.get("priority").isJsonNull()) {
+        PriorityEnum.validateJsonElement(jsonObj.get("priority"));
+      }
   }
 
   public static class CustomTypeAdapterFactory implements TypeAdapterFactory {
diff --git a/src/main/java/com/bandwidth/sdk/model/MessageSendingCallbackMessage.java b/src/main/java/com/bandwidth/sdk/model/MessageSendingCallbackMessage.java
index 14f30700..02185726 100644
--- a/src/main/java/com/bandwidth/sdk/model/MessageSendingCallbackMessage.java
+++ b/src/main/java/com/bandwidth/sdk/model/MessageSendingCallbackMessage.java
@@ -344,7 +344,7 @@ public MessageSendingCallbackMessage priority(PriorityEnum priority) {
    * Get priority
    * @return priority
   **/
-  @javax.annotation.Nonnull
+  @javax.annotation.Nullable
   public PriorityEnum getPriority() {
     return priority;
   }
@@ -492,7 +492,6 @@ private String toIndentedString(Object o) {
     openapiRequiredFields.add("from");
     openapiRequiredFields.add("text");
     openapiRequiredFields.add("media");
-    openapiRequiredFields.add("priority");
   }
 
  /**
@@ -547,8 +546,10 @@ public static void validateJsonElement(JsonElement jsonElement) throws IOExcepti
       } else if (!jsonObj.get("media").isJsonArray()) {
         throw new IllegalArgumentException(String.format("Expected the field `media` to be an array in the JSON string but got `%s`", jsonObj.get("media").toString()));
       }
-      // validate the required field `priority`
-      PriorityEnum.validateJsonElement(jsonObj.get("priority"));
+      // validate the optional field `priority`
+      if (jsonObj.get("priority") != null && !jsonObj.get("priority").isJsonNull()) {
+        PriorityEnum.validateJsonElement(jsonObj.get("priority"));
+      }
   }
 
   public static class CustomTypeAdapterFactory implements TypeAdapterFactory {