diff --git a/.gitmodules b/.gitmodules
index 81c6b8e8..c14bb9c5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -30,3 +30,6 @@
 	path = third_party/google-toolbox-for-mac/google-toolbox-for-mac
 	url = https://github.com/google/google-toolbox-for-mac.git
 	branch = main
+[submodule "third_party/mbedtls"]
+	path = third_party/mbedtls
+	url = https://github.com/ARMmbed/mbedtls
diff --git a/third_party/mbedtls b/third_party/mbedtls
new file mode 160000
index 00000000..3e0418fe
--- /dev/null
+++ b/third_party/mbedtls
@@ -0,0 +1 @@
+Subproject commit 3e0418fe502b2a2194e118d362efdfc0e558be73