diff --git a/pkgs/development/python-modules/langchain-core/default.nix b/pkgs/development/python-modules/langchain-core/default.nix
index c1951c23e86e..1ed827340d1d 100644
--- a/pkgs/development/python-modules/langchain-core/default.nix
+++ b/pkgs/development/python-modules/langchain-core/default.nix
@@ -36,14 +36,14 @@
 
 buildPythonPackage rec {
   pname = "langchain-core";
-  version = "0.3.65";
+  version = "0.3.66";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "langchain-ai";
     repo = "langchain";
     tag = "langchain-core==${version}";
-    hash = "sha256-2iEUrLjvjVpArOPXzF5Z6ZeeQbIGZxuZUTC2buYTOCQ=";
+    hash = "sha256-k9B2ApNyX3w6RTt/XdOl2FvU87NuZSi96vvfJOnBltM=";
   };
 
   sourceRoot = "${src.name}/libs/core";