diff --git a/src/Schematron/Schematron.csproj b/src/Schematron/Schematron.csproj
index b59228f..4fcdeef 100644
--- a/src/Schematron/Schematron.csproj
+++ b/src/Schematron/Schematron.csproj
@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="PolySharp" Version="1.15.0" PrivateAssets="all" />
+    <PackageReference Include="PolySharp" Version="1.17.0" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>