diff --git a/pkgs/development/python-modules/python-lsp-server/default.nix b/pkgs/development/python-modules/python-lsp-server/default.nix
index ec65059f54df..4c9cf5003cce 100644
--- a/pkgs/development/python-modules/python-lsp-server/default.nix
+++ b/pkgs/development/python-modules/python-lsp-server/default.nix
@@ -23,6 +23,7 @@
 , rope
 , setuptools
 , setuptools-scm
+, toml
 , ujson
 , websockets
 , whatthepatch
@@ -79,6 +80,7 @@ buildPythonPackage rec {
       pyflakes
       pylint
       rope
+      toml
       whatthepatch
       yapf
     ];