diff --git a/pyproject.toml b/pyproject.toml
index c68fcc4..5f3fb5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: PyPy",
   "Programming Language :: Python",
 ]
-dependencies = []
+dependencies = ["packaging"]
 
 [dependency-groups]
 aiopg = ["aiopg"]