diff --git a/src/RxFree.SourceTests.Legacy/RxFree.SourceTests.Legacy.csproj b/src/RxFree.SourceTests.Legacy/RxFree.SourceTests.Legacy.csproj
index e4c6ff4..7a98148 100644
--- a/src/RxFree.SourceTests.Legacy/RxFree.SourceTests.Legacy.csproj
+++ b/src/RxFree.SourceTests.Legacy/RxFree.SourceTests.Legacy.csproj
@@ -16,7 +16,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />
diff --git a/src/RxFree.SourceTests.Nullable/RxFree.SourceTests.Nullable.csproj b/src/RxFree.SourceTests.Nullable/RxFree.SourceTests.Nullable.csproj
index 326f3e9..c350f48 100644
--- a/src/RxFree.SourceTests.Nullable/RxFree.SourceTests.Nullable.csproj
+++ b/src/RxFree.SourceTests.Nullable/RxFree.SourceTests.Nullable.csproj
@@ -16,7 +16,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />
diff --git a/src/RxFree.SourceTests/RxFree.SourceTests.csproj b/src/RxFree.SourceTests/RxFree.SourceTests.csproj
index 18f49bf..c49e4cf 100644
--- a/src/RxFree.SourceTests/RxFree.SourceTests.csproj
+++ b/src/RxFree.SourceTests/RxFree.SourceTests.csproj
@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <Import Project="..\RxFree\build\RxFree.targets" />
diff --git a/src/RxFree.Tests/RxFree.Tests.csproj b/src/RxFree.Tests/RxFree.Tests.csproj
index 6691447..c0e26c9 100644
--- a/src/RxFree.Tests/RxFree.Tests.csproj
+++ b/src/RxFree.Tests/RxFree.Tests.csproj
@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <ItemGroup>