diff --git a/Package.resolved b/Package.resolved
index 29877e6..c7e0485 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -66,9 +66,10 @@
     {
       "identity" : "llmfarm_core.swift",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/guinmoon/llmfarm_core.swift",
+      "location" : "https://github.com/buhe/llmfarm_core.swift",
       "state" : {
-        "revision" : "7226a84a69361c312c997453827c609e613585fd"
+        "branch" : "langchain",
+        "revision" : "927d670751bc8aebbc5eb845afd36fe1eeef4f5a"
       }
     },
     {
diff --git a/Package.swift b/Package.swift
index 88dd235..be04c96 100644
--- a/Package.swift
+++ b/Package.swift
@@ -26,7 +26,7 @@ let package = Package(
         .package(url: "https://github.com/juyan/swift-filestore", .upToNextMajor(from: "0.5.0")),
         .package(url: "https://github.com/ZachNagengast/similarity-search-kit.git", from: "0.0.11"),
         .package(url: "https://github.com/google/generative-ai-swift", .upToNextMajor(from: "0.4.4")),
-        .package(url: "https://github.com/guinmoon/llmfarm_core.swift", .revision("7226a84a69361c312c997453827c609e613585fd")),
+        .package(url: "https://github.com/buhe/llmfarm_core.swift", .branch("langchain")),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.