diff --git a/TensionDev.ULID.Serialization.SystemTextJson.Tests/TensionDev.ULID.Serialization.SystemTextJson.Tests.csproj b/TensionDev.ULID.Serialization.SystemTextJson.Tests/TensionDev.ULID.Serialization.SystemTextJson.Tests.csproj
index af0d555..bbfe673 100644
--- a/TensionDev.ULID.Serialization.SystemTextJson.Tests/TensionDev.ULID.Serialization.SystemTextJson.Tests.csproj
+++ b/TensionDev.ULID.Serialization.SystemTextJson.Tests/TensionDev.ULID.Serialization.SystemTextJson.Tests.csproj
@@ -11,7 +11,7 @@
 
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+    <PackageReference Include="Moq" Version="4.21.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0">
       <PrivateAssets>all</PrivateAssets>