diff --git a/ext/doctest b/ext/doctest
index b2611a1..abb864e 160000
--- a/ext/doctest
+++ b/ext/doctest
@@ -1 +1 @@
-Subproject commit b2611a140fe67d983b7078a3d3cf76a79efaaa9b
+Subproject commit abb864e8028e48f08525b8cb35c61b8f373e04c6