diff --git a/.gitmodules b/.gitmodules
index fb551060a..9a5d89d00 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -140,3 +140,6 @@
 [submodule "hw/mcu/allwinner"]
 	path = hw/mcu/allwinner
 	url = https://github.com/hathach/allwinner_driver.git
+[submodule "lib/Pico-PIO-USB"]
+	path = lib/Pico-PIO-USB
+	url = https://github.com/hathach/Pico-PIO-USB.git
diff --git a/lib/Pico-PIO-USB b/lib/Pico-PIO-USB
index 7d6729900..ee20881ac 160000
--- a/lib/Pico-PIO-USB
+++ b/lib/Pico-PIO-USB
@@ -1 +1 @@
-Subproject commit 7d672990011695892da523cb0ac29a2c7243a4c9
+Subproject commit ee20881ac8abc515df5e0cfe8851c7c21c47a0ef