diff --git a/pkgs/development/python-modules/langchain-tests/default.nix b/pkgs/development/python-modules/langchain-tests/default.nix
index c9c3659a7ae3..485477679311 100644
--- a/pkgs/development/python-modules/langchain-tests/default.nix
+++ b/pkgs/development/python-modules/langchain-tests/default.nix
@@ -30,14 +30,14 @@
 
 buildPythonPackage rec {
   pname = "langchain-tests";
-  version = "0.3.20";
+  version = "0.3.21";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "langchain-ai";
     repo = "langchain";
     tag = "langchain-tests==${version}";
-    hash = "sha256-RMuxWA/n8d71FReFKO3Y/5P0MYk4aZ5WU2/TRxf9UuE=";
+    hash = "sha256-CufnUFhYTENuq4/32u0w3UZb7TdZxEpshyQqLH6NEZo=";
   };
 
   sourceRoot = "${src.name}/libs/standard-tests";
@@ -81,6 +81,7 @@ buildPythonPackage rec {
   };
 
   meta = {
+    changelog = "https://github.com/langchain-ai/langchain/releases/tag/${src.tag}";
     description = "Build context-aware reasoning applications";
     homepage = "https://github.com/langchain-ai/langchain";
     license = lib.licenses.mit;