diff --git a/pyproject.toml b/pyproject.toml
index 1f592e7..6656ef5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ skyfield-data = ">=3,<5"
 python-dateutil = "^2.8"
 
 [tool.poetry.dev-dependencies]
-black = "^22.1"
+black = "^23.1"
 parameterized = "^0.8.1"
 coverage = "^6.1.2"
 coveralls = "^3.3.1"