diff --git a/earned_time/pyproject.toml b/earned_time/pyproject.toml
index fa4dc9f..52ac392 100644
--- a/earned_time/pyproject.toml
+++ b/earned_time/pyproject.toml
@@ -25,8 +25,6 @@ ignore = [
     "COM812",
     "ISC001",
     "S603",
-    # personal repo, no copyright policy (ruff 0.17 made CPY001 stable under select=ALL)
-    "CPY001",
 ]
 fixable = ["ALL"]
 unfixable = []