diff --git a/.gitmodules b/.gitmodules
index 474ae9890b..a92757df2c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -23,6 +23,7 @@
 [submodule "lib/asf4"]
 	path = lib/asf4
 	url = https://github.com/adafruit/asf4
+	branch = circuitpython
 [submodule "lib/tinyusb"]
 	path = lib/tinyusb
 	url = https://github.com/hathach/tinyusb
diff --git a/lib/asf4 b/lib/asf4
index d270f79aa1..84f56af132 160000
--- a/lib/asf4
+++ b/lib/asf4
@@ -1 +1 @@
-Subproject commit d270f79aa16dd8fd4ae3b6c14544283dcb992e9c
+Subproject commit 84f56af13292d8f32c40acbd949bde698ddd4507