diff --git a/sdk/dotNet/README.md b/sdk/dotNet/README.md
index 107983ca..2110d71c 100644
--- a/sdk/dotNet/README.md
+++ b/sdk/dotNet/README.md
@@ -3,6 +3,10 @@
 
 # Change Log
 
+## 16.6.4
+
+* KSM-466 - Fixed ExpiresOn conversion from UnixTimeMilliseconds. Closes [Issue #533]
+
 ## 16.6.3
 
 * KSM-462 - Fixed JSON serializer that replaces characters with accents. Closes [Issue #523](https://github.com/Keeper-Security/secrets-manager/issues/523)
diff --git a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.Extension/SecretManagement.Keeper.Extension.psd1 b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.Extension/SecretManagement.Keeper.Extension.psd1
index b280139d..46074a60 100644
--- a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.Extension/SecretManagement.Keeper.Extension.psd1
+++ b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.Extension/SecretManagement.Keeper.Extension.psd1
@@ -1,5 +1,5 @@
 @{
-    ModuleVersion = '16.6.2'
+    ModuleVersion = '16.6.4'
     RootModule = 'SecretManagement.Keeper.Extension.psm1'
     RequiredAssemblies = '../SecretManagement.Keeper.dll'    
     CompatiblePSEditions = @('Core')
diff --git a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.csproj b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.csproj
index c624a49a..6bdf4956 100644
--- a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.csproj
+++ b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.csproj
@@ -4,8 +4,8 @@
         <TargetFramework>netstandard2.1</TargetFramework>
         <AssemblyName>SecretManagement.Keeper</AssemblyName>
         <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
-        <AssemblyVersion>16.6.2</AssemblyVersion>
-        <FileVersion>16.6.2</FileVersion>
+        <AssemblyVersion>16.6.4</AssemblyVersion>
+        <FileVersion>16.6.4</FileVersion>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.psd1 b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.psd1
index a68da726..15685c93 100644
--- a/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.psd1
+++ b/sdk/dotNet/SecretManagement.Keeper/SecretManagement.Keeper.psd1
@@ -1,5 +1,5 @@
 @{
-    ModuleVersion = '16.6.1'
+    ModuleVersion = '16.6.4'
     CompatiblePSEditions = @('Core')
     GUID = '20ab89cb-f0dd-4e8e-b276-f3a7708c1eb2'
     Author = 'Sergey Aldoukhov'
diff --git a/sdk/dotNet/SecretsManager/SecretsManager.csproj b/sdk/dotNet/SecretsManager/SecretsManager.csproj
index 26e7aac4..93d49b19 100644
--- a/sdk/dotNet/SecretsManager/SecretsManager.csproj
+++ b/sdk/dotNet/SecretsManager/SecretsManager.csproj
@@ -5,9 +5,9 @@
         <LangVersion>9</LangVersion>
         <Company>Keeper Security Inc.</Company>
         <Product>SecretsManager .Net SDK</Product>
-        <AssemblyVersion>16.6.3</AssemblyVersion>
-        <FileVersion>16.6.3</FileVersion>
-        <PackageVersion>16.6.3</PackageVersion>
+        <AssemblyVersion>16.6.4</AssemblyVersion>
+        <FileVersion>16.6.4</FileVersion>
+        <PackageVersion>16.6.4</PackageVersion>
         <NeutralLanguage>en-US</NeutralLanguage>
         <PackageId>Keeper.SecretsManager</PackageId>
         <Authors>Sergey Aldoukhov</Authors>
diff --git a/sdk/dotNet/SecretsManager/SecretsManagerClient.cs b/sdk/dotNet/SecretsManager/SecretsManagerClient.cs
index 44b3facc..44202c7a 100644
--- a/sdk/dotNet/SecretsManager/SecretsManagerClient.cs
+++ b/sdk/dotNet/SecretsManager/SecretsManagerClient.cs
@@ -1085,7 +1085,7 @@ private static async Task<Tuple<KeeperSecrets, bool>> FetchAndDecryptSecrets(Sec
             var appData = response.appData == null
                 ? null :
                 JsonUtils.ParseJson<AppData>(CryptoUtils.Decrypt(CryptoUtils.WebSafe64ToBytes(response.appData), appKey));
-            var secrets = new KeeperSecrets(appData, response.expiresOn == 0 ? null : DateTimeOffset.FromUnixTimeSeconds(response.expiresOn), records.ToArray());
+            var secrets = new KeeperSecrets(appData, response.expiresOn == 0 ? null : DateTimeOffset.FromUnixTimeMilliseconds(response.expiresOn), records.ToArray());
             if (response.warnings is { Length: > 0 })
             {
                 secrets.Warnings = response.warnings;