diff --git a/pyproject.toml b/pyproject.toml
index 7fd6d26..2712dad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ markers = "platform_machine in 'armv6l,armv7l,armv8l,armv8b,aarch64'"
 gui = ["wxPython", "pywin32", "zeroconf", "pyuac", "pylnk3"]
 
 [tool.poetry.dev-dependencies]
-black = "^24.1.0"
+black = {version = "^24.1.0", optional = true, markers = "python_version >= '3.8'"}
 isort = "^5.10.1"
 autoflake = "^1.4"