diff --git a/IndicoV2.IntegrationTests/IndicoV2.IntegrationTests.csproj b/IndicoV2.IntegrationTests/IndicoV2.IntegrationTests.csproj
index 152f644..5777d5c 100644
--- a/IndicoV2.IntegrationTests/IndicoV2.IntegrationTests.csproj
+++ b/IndicoV2.IntegrationTests/IndicoV2.IntegrationTests.csproj
@@ -17,7 +17,7 @@
   <ItemGroup>
     <ProjectReference Include="..\IndicoV2.Abstractions\IndicoV2.Abstractions.csproj" />
     <ProjectReference Include="..\IndicoV2\IndicoV2.csproj" />
-    <PackageReference Include="MimeKit" Version="2.11.0" />
+    <PackageReference Include="MimeKit" Version="4.15.1" />
   </ItemGroup>
 
   <ItemGroup>