diff --git a/src/MarkZither.Rag.Chunking/MarkZither.Rag.Chunking.csproj b/src/MarkZither.Rag.Chunking/MarkZither.Rag.Chunking.csproj
index 32ab015..d7e9cd7 100644
--- a/src/MarkZither.Rag.Chunking/MarkZither.Rag.Chunking.csproj
+++ b/src/MarkZither.Rag.Chunking/MarkZither.Rag.Chunking.csproj
@@ -23,7 +23,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.*" />
-    <PackageReference Include="Tiktoken" Version="2.0.3" />
+    <PackageReference Include="Tiktoken" Version="3.1.5" />
   </ItemGroup>
 
   <ItemGroup>