diff --git a/pkgs/development/python-modules/langchain-core/default.nix b/pkgs/development/python-modules/langchain-core/default.nix
index 5e7f6be35c22..440a2d193162 100644
--- a/pkgs/development/python-modules/langchain-core/default.nix
+++ b/pkgs/development/python-modules/langchain-core/default.nix
@@ -9,6 +9,7 @@
 
   # dependencies
   jsonpatch,
+  langchain-protocol,
   langsmith,
   packaging,
   pydantic,
@@ -52,6 +53,7 @@ buildPythonPackage (finalAttrs: {
 
   dependencies = [
     jsonpatch
+    langchain-protocol
     langsmith
     packaging
     pydantic