diff --git a/pyproject.toml b/pyproject.toml
index 3b4ec835..8850267a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dependencies = [
 dynamic = ["version"]
 
 [project.optional-dependencies]
-dev = ["pytest==7.4.2", "pytest-cov==4.1.0", "black==23.9.1", "flake8==6.1.0"]
+dev = ["pytest==7.4.2", "pytest-cov==4.1.0", "black==23.10.0", "flake8==6.1.0"]
 
 [project.urls]
 homepage = "https://github.com/LBC-LNBio/pyKVFinder/"