diff --git a/pyproject.toml b/pyproject.toml
index 3410809..876cb06 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,8 @@ classifiers = [
 ]
 dependencies = [
     "setuptools",
-    "importlib_metadata"
+    "importlib_metadata",
+    "packaging"
 ]
 dynamic = ["version"]