diff --git a/src/core-taggeds/Taggeds/Taggeds.csproj b/src/core-taggeds/Taggeds/Taggeds.csproj
index b926a1b6..20ba6827 100644
--- a/src/core-taggeds/Taggeds/Taggeds.csproj
+++ b/src/core-taggeds/Taggeds/Taggeds.csproj
@@ -34,7 +34,7 @@
 
   <ItemGroup>
     <PackageReference Include="PrimeFuncPack.Core.Failure" Version="2.2.0" />
-    <PackageReference Include="PrimeFuncPack.Core.Optional" Version="2.2.0-preview.3" />
+    <PackageReference Include="PrimeFuncPack.Core.Optional" Version="2.2.0-preview.4" />
     <PackageReference Include="PrimeFuncPack.Core.Result" Version="2.1.0-preview.4" />
     <PackageReference Include="PrimeFuncPack.Core.TaggedUnion" Version="2.1.0-preview.3" />
     <PackageReference Include="PrimeFuncPack.Core.Unit" Version="2.2.1" />