diff --git a/src/SimpleOptics.fsproj b/src/SimpleOptics.fsproj
index f0fa319..a85da2d 100644
--- a/src/SimpleOptics.fsproj
+++ b/src/SimpleOptics.fsproj
@@ -28,6 +28,6 @@
     <Content Include="*.fsproj; **\*.fs; **\*.fsi" PackagePath="fable/" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Update="FSharp.Core" Version="8.0.100" />
+    <PackageReference Update="FSharp.Core" Version="9.0.303" />
   </ItemGroup>
 </Project>