diff --git a/src/ExcelFinancialFunctions/ExcelFinancialFunctions.fsproj b/src/ExcelFinancialFunctions/ExcelFinancialFunctions.fsproj
index dd68ec2..225bd5f 100644
--- a/src/ExcelFinancialFunctions/ExcelFinancialFunctions.fsproj
+++ b/src/ExcelFinancialFunctions/ExcelFinancialFunctions.fsproj
@@ -21,6 +21,8 @@
     <PackageIcon>logo.png</PackageIcon>
     <PackageProjectUrl>https://fsprojects.github.io/ExcelFinancialFunctions</PackageProjectUrl>
     <PackageTags>excel;finance;fsharp;csharp</PackageTags>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>ExcelFinancialFunctions.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/ExcelFinancialFunctions/ExcelFinancialFunctions.snk b/src/ExcelFinancialFunctions/ExcelFinancialFunctions.snk
new file mode 100644
index 0000000..9ce9dc8
Binary files /dev/null and b/src/ExcelFinancialFunctions/ExcelFinancialFunctions.snk differ