diff --git a/pyproject.toml b/pyproject.toml
index b0d2553..097f94b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "black==26.3.1",
+    "black==26.5.1",
     "build==1.4.4",
     "mypy==1.19.1",
     "pytest==9.0.3",