diff --git a/CHANGELOG.md b/CHANGELOG.md
index cee5cba5..c14a6a1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -188,4 +188,16 @@ Fixed handling of No Content responses
 
 ### Added
 
-- Added funding_source and parcelguard to insurance provider enumeration
\ No newline at end of file
+- Added funding_source and parcelguard to insurance provider enumeration
+
+## 2.3.3
+
+### Changed
+
+- update System.Text.Json to latest version 8.0.5
+
+## 2.3.4
+
+### Added
+
+- Added error code MultipackageNotSupported
\ No newline at end of file
diff --git a/ShipEngineSDK/Enums/ErrorCode.cs b/ShipEngineSDK/Enums/ErrorCode.cs
index 26fdc481..bdd42949 100644
--- a/ShipEngineSDK/Enums/ErrorCode.cs
+++ b/ShipEngineSDK/Enums/ErrorCode.cs
@@ -261,5 +261,11 @@ public enum ErrorCode
         /// </summary>
         [EnumMember(Value = "webhook_event_type_conflict")]
         WebhookEventTypeConflict,
+
+        /// <summary>
+        /// The attempted operation does not support multiple packages.
+        /// </summary>
+        [EnumMember(Value = "multipackage_not_supported")]
+        MultipackageNotSupported,
     }
 }
\ No newline at end of file
diff --git a/ShipEngineSDK/PublicAPI.Shipped.txt b/ShipEngineSDK/PublicAPI.Shipped.txt
index 470c837f..0e393f53 100644
--- a/ShipEngineSDK/PublicAPI.Shipped.txt
+++ b/ShipEngineSDK/PublicAPI.Shipped.txt
@@ -857,6 +857,7 @@ ShipEngineSDK.ErrorCode.InvalidStatus = 20 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.InvalidStringLength = 21 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.LabelImagesNotSupported = 22 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.MeterFailure = 23 -> ShipEngineSDK.ErrorCode
+ShipEngineSDK.ErrorCode.MultipackageNotSupported = 39 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.NoRatesReturned = 25 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.NotFound = 24 -> ShipEngineSDK.ErrorCode
 ShipEngineSDK.ErrorCode.RateLimitExceeded = 26 -> ShipEngineSDK.ErrorCode
@@ -1592,4 +1593,4 @@ virtual ShipEngineSDK.ShipEngineMock.VoidLabelWithLabelId(string! labelId, ShipE
 ~ShipEngineSDK.ValidateAddresses.Result.NormalizedAddress.get -> ShipEngineSDK.Common.Address
 ~ShipEngineSDK.ValidateAddresses.Result.NormalizedAddress.set -> void
 ~ShipEngineSDK.ValidateAddresses.Result.OriginalAddress.get -> ShipEngineSDK.Common.Address
-~ShipEngineSDK.ValidateAddresses.Result.OriginalAddress.set -> void
\ No newline at end of file
+~ShipEngineSDK.ValidateAddresses.Result.OriginalAddress.set -> void
diff --git a/ShipEngineSDK/ShipEngineSDK.csproj b/ShipEngineSDK/ShipEngineSDK.csproj
index 43c01372..b796f82e 100644
--- a/ShipEngineSDK/ShipEngineSDK.csproj
+++ b/ShipEngineSDK/ShipEngineSDK.csproj
@@ -4,7 +4,7 @@
 		<PackageId>ShipEngine</PackageId>
 		<PackageTags>sdk;rest;api;shipping;rates;label;tracking;cost;address;validation;normalization;fedex;ups;usps;</PackageTags>
 
-		<Version>2.3.3</Version>
+		<Version>2.3.4</Version>
 		<Authors>ShipEngine</Authors>
 		<Company>ShipEngine</Company>
 		<Summary>The official ShipEngine C# SDK for .NET</Summary>
diff --git a/openapitools.json b/openapitools.json
index b1e22509..570cc2bd 100644
--- a/openapitools.json
+++ b/openapitools.json
@@ -13,7 +13,7 @@
         "packageName": "ShipEngineSDK",
         "ignoreFileOverride": "./.openapi-generator-ignore",
         "additionalProperties": {
-          "packageVersion": "2.2.0",
+          "packageVersion": "2.3.4",
           "targetFramework": "netstandard2.0",
           "validatable": false,
           "sourceFolder": "",