diff --git a/pyproject.toml b/pyproject.toml
index f12a9725..6c8a781e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,8 +26,8 @@ torch = ">=1.9.0"
 torchtyping = ">=0.1.4"
 
 # dev dependencies.
-black = { version = "22.3.0", optional = true }
-flake8 = { version = "*", optional = true }
+black = { version = "23.7.0", optional = true }
+flake8 = { version = "2.0.0", optional = true }
 gitmopy = { version = "*", optional = true }
 myst-parser = { version = "*", optional = true }
 pre-commit = { version = "*", optional = true }