diff --git a/.gitmodules b/.gitmodules
index bb62a5c39d..010b6c879e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -101,3 +101,6 @@
 [submodule "ports/cxd56/spresense-exported-sdk"]
 	path = ports/cxd56/spresense-exported-sdk
 	url = https://github.com/sonydevworld/spresense-exported-sdk.git
+[submodule "frozen/Adafruit_CircuitPython_SD"]
+	path = frozen/Adafruit_CircuitPython_SD
+	url = ../../adafruit/Adafruit_CircuitPython_SD.git
diff --git a/frozen/Adafruit_CircuitPython_SD b/frozen/Adafruit_CircuitPython_SD
new file mode 160000
index 0000000000..5ad33e4ca2
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_SD
@@ -0,0 +1 @@
+Subproject commit 5ad33e4ca219f0e216beab439cfa259cde32016c