diff --git a/setup.py b/setup.py
index 1d4056f..46d4a92 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
     ],
     extras_require={
         "plot": ["matplotlib>=3.6", "pyeit>=1.2"],
-        "test": ["matplotlib>=3.6", "pytest>=7", "ruff>=0.11"],
+        "test": ["matplotlib>=3.6", "pytest>=7", "ruff>=0.11,<0.12"],
     },
     classifiers=[
         "Programming Language :: Python :: 3",