diff --git a/pyproject.toml b/pyproject.toml
index e3f82db534..d49d98b52b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,7 +60,4 @@ ignore = [
     "UP030", # implicit references for positional format fields
     "UP031", # Replace % with .format
     "UP032", # Replace .format with f-string
-
-    # Deprecated Ruff rules.
-    "UP038", # Use X | Y in isinstance
 ]