diff --git a/third_party/pigweed/src b/third_party/pigweed/src
index 9b1e38c..a2b21f2 160000
--- a/third_party/pigweed/src
+++ b/third_party/pigweed/src
@@ -1 +1 @@
-Subproject commit 9b1e38c0b5cbefce1f1ceabefbf63a3175b4823f
+Subproject commit a2b21f20127369137c0a24ba1aa91dba86ce9197