diff --git a/build.fsproj b/build.fsproj
index 6cc8f9b..d1f4f41 100644
--- a/build.fsproj
+++ b/build.fsproj
@@ -16,7 +16,7 @@
       <PackageReference Include="NuGet.Common" Version="6.13.2" />
       <PackageReference Include="NuGet.Packaging" Version="6.13.2" />
       <PackageReference Include="NuGet.Protocol" Version="6.13.2" />
-      <PackageReference Include="System.Formats.Asn1" Version="8.0.1" />
+      <PackageReference Include="System.Formats.Asn1" Version="9.0.4" />
     </ItemGroup>
     
   </Project>
\ No newline at end of file