diff --git a/pkgs/development/python-modules/langchain-deepseek/default.nix b/pkgs/development/python-modules/langchain-deepseek/default.nix
index 97edc2cae949..9ddeb8eb4310 100644
--- a/pkgs/development/python-modules/langchain-deepseek/default.nix
+++ b/pkgs/development/python-modules/langchain-deepseek/default.nix
@@ -5,7 +5,6 @@
 
   # build-system
   pdm-backend,
-  poetry-core,
 
   # dependencies
   langchain-core,