diff --git a/src/Spark.Engine.Test/Spark.Engine.Test.csproj b/src/Spark.Engine.Test/Spark.Engine.Test.csproj
index c5cefcae..d7304547 100644
--- a/src/Spark.Engine.Test/Spark.Engine.Test.csproj
+++ b/src/Spark.Engine.Test/Spark.Engine.Test.csproj
@@ -12,7 +12,7 @@
     <PackageReference Include="MSTest.TestAdapter" Version="3.1.1" />
     <PackageReference Include="MSTest.TestFramework" Version="3.1.1" />
     <PackageReference Include="NuGet.Versioning" Version="6.8.0" />
-    <PackageReference Include="xunit" Version="2.6.5" />
+    <PackageReference Include="xunit" Version="2.6.6" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/src/Spark.Mongo.Tests/Spark.Mongo.Tests.csproj b/src/Spark.Mongo.Tests/Spark.Mongo.Tests.csproj
index a8468a41..9d43916c 100644
--- a/src/Spark.Mongo.Tests/Spark.Mongo.Tests.csproj
+++ b/src/Spark.Mongo.Tests/Spark.Mongo.Tests.csproj
@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.6.5" />
+    <PackageReference Include="xunit" Version="2.6.6" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>