diff --git a/pyproject.toml b/pyproject.toml
index 5afb681..246a001 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,11 +7,10 @@ authors = [
 ]
 dependencies = [
     "charset-normalizer>=2.1.1",
+    "pyparsing>=3.1.1",
 ]
 requires-python = ">=3.9"
 license = {text = "MIT"}
-[project.optional-dependencies]
-
 [build-system]
 requires = ["pdm-pep517>=1.0.0"]
 build-backend = "pdm.pep517.api"