diff --git a/pyproject.toml b/pyproject.toml
index 4afc5ec..d006449 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ Documentation = "https://mariofix.github.io/pyflowcl"
 [project.optional-dependencies]
 dev = [
     "pre-commit (>=4.6.0,<5.0.0)",
-    "black (>=26.3.1,<27.0.0)",
+    "black (>=26.5.1,<27.0.0)",
     "coverage (>=7.14.0,<8.0.0)",
     "pytest (>=9.0.3,<10.0.0)",
     "mkdocs-material[git,imaging,recomended] (>=9.7.6,<10.0.0)",