diff --git a/pyproject.toml b/pyproject.toml
index 4343fb9..bb20e03 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ mypy = "^1.3.0"
 types-requests = "^2.25.8"
 requests-mock = "^1.9.3"
 isort = "^5.11.5"
-types-python-dateutil = "*.*.*"
+types-python-dateutil = "^2.8.19.14"
 
 [tool.black]
 exclude = ".*simpleeval.*"