diff --git a/pyproject.toml b/pyproject.toml
index 14cd2c2a..b736b5d6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -410,6 +410,7 @@ plugins = [
 
 [tool.pyrefly]
 errors.non-exhaustive-match = "error"
+errors.unused-ignore = "error"
 
 [tool.pyright]
 typeCheckingMode = "strict"