diff --git a/pkgs/development/python-modules/langchain-anthropic/default.nix b/pkgs/development/python-modules/langchain-anthropic/default.nix
index f925977727d5..3ca06b41a74d 100644
--- a/pkgs/development/python-modules/langchain-anthropic/default.nix
+++ b/pkgs/development/python-modules/langchain-anthropic/default.nix
@@ -22,19 +22,19 @@
   gitUpdater,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "langchain-anthropic";
-  version = "1.3.3";
+  version = "1.3.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "langchain-ai";
     repo = "langchain";
-    tag = "langchain-anthropic==${version}";
-    hash = "sha256-vQ2h92oP3gpSEu3HjQUF+1KWX9gm4Q7osTynu77UlvA=";
+    tag = "langchain-anthropic==${finalAttrs.version}";
+    hash = "sha256-8dGP26N2aheMTtI2wYMBVitlzrTsJZa5Zt5xVl+vqI4=";
   };
 
-  sourceRoot = "${src.name}/libs/partners/anthropic";
+  sourceRoot = "${finalAttrs.src.name}/libs/partners/anthropic";
 
   build-system = [ hatchling ];
 
@@ -72,7 +72,7 @@ buildPythonPackage rec {
   };
 
   meta = {
-    changelog = "https://github.com/langchain-ai/langchain-anthropic/releases/tag/${src.tag}";
+    changelog = "https://github.com/langchain-ai/langchain-anthropic/releases/tag/${finalAttrs.src.tag}";
     description = "Build LangChain applications with Anthropic";
     homepage = "https://github.com/langchain-ai/langchain/tree/master/libs/partners/anthropic";
     license = lib.licenses.mit;
@@ -80,4 +80,4 @@ buildPythonPackage rec {
       lib.maintainers.sarahec
     ];
   };
-}
+})