diff --git a/Didstopia.PDFSharp.Tests/Didstopia.PDFSharp.Tests.csproj b/Didstopia.PDFSharp.Tests/Didstopia.PDFSharp.Tests.csproj
index 27652d5..53d5922 100644
--- a/Didstopia.PDFSharp.Tests/Didstopia.PDFSharp.Tests.csproj
+++ b/Didstopia.PDFSharp.Tests/Didstopia.PDFSharp.Tests.csproj
@@ -16,9 +16,9 @@ This is a modified fork based on several OSS projects. For more information see
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   <ItemGroup>
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-    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0-preview-20170810-02" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
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   <ItemGroup>