diff --git a/pyproject.toml b/pyproject.toml
index ef190eb..9e0a8b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "black (>=26.3.1,<26.4.0)",
+    "black (>=26.5.0,<26.6.0)",
     "build (>=1.4.4,<1.5.0)",
     "isort (>=8.0.1,<8.1.0)",
     "types-pytz (>=2025.2.0.20250326,<2025.3.0.0)",