diff --git a/pyproject.toml b/pyproject.toml
index ed916ea..0256f06 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,9 @@ akkudoktoreosserver = ["data/*.npz", ]
 [tool.isort]
 profile = "black"
 
+[tool.ruff]
+line-length = 100
+
 [tool.ruff.lint]
 ignore = [
     "F841",  # don't complain about unused variables