diff --git a/firmware/libopencm3 b/firmware/libopencm3
index 0f435b51..28e93221 160000
--- a/firmware/libopencm3
+++ b/firmware/libopencm3
@@ -1 +1 @@
-Subproject commit 0f435b51f60cc8539641789b670f6f003412d744
+Subproject commit 28e93221cab64bb4fa6e818f29d96107d2c8a6b9