diff --git a/tox.ini b/tox.ini
index 4a0ae28..66217a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,7 +33,7 @@ commands =
     ruff check
     ruff format --check
 deps =
-    ruff
+    ruff==0.15.4
 
 [testenv:py310]
 basepython = python3.10