diff --git a/ooxml/NPOI.OOXML.Core.csproj b/ooxml/NPOI.OOXML.Core.csproj
index 11bb7f393..39e6f0ec4 100644
--- a/ooxml/NPOI.OOXML.Core.csproj
+++ b/ooxml/NPOI.OOXML.Core.csproj
@@ -27,6 +27,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.Security.Cryptography.Xml" Version="6.0.1" />
+    <PackageReference Include="System.Security.Cryptography.Pkcs" Version="6.0.3" />
   </ItemGroup>
 
   <ItemGroup>