diff --git a/frozen/Adafruit_CircuitPython_RFM9x b/frozen/Adafruit_CircuitPython_RFM9x
new file mode 160000
index 0000000000..6485df1279
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_RFM9x
@@ -0,0 +1 @@
+Subproject commit 6485df1279aac2d42a86861d27df5e692efbfc78
diff --git a/ports/esp32s2/CMakeLists.txt b/ports/esp32s2/CMakeLists.txt
index c99c1c7e78..716588cf22 100644
--- a/ports/esp32s2/CMakeLists.txt
+++ b/ports/esp32s2/CMakeLists.txt
@@ -1,6 +1,6 @@
 # The following five lines of boilerplate have to be in your project's
 # CMakeLists in this exact order for cmake to work correctly
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.13)
 
 set(ENV{IDF_PATH} ${CMAKE_SOURCE_DIR}/esp-idf)
 set(COMPONENTS esptool_py soc driver log main)