diff --git a/_test_data/sandbox/clean/child.txt b/_test_data/sandbox/clean/child.txt
index ce0a7e6..1921ec8 100644
--- a/_test_data/sandbox/clean/child.txt
+++ b/_test_data/sandbox/clean/child.txt
@@ -1,3 +1,3 @@
 clean stack: child branch
 purpose: child PR on top of sandbox-clean-base
-marker: 7262f98
+marker: d960328