diff --git a/.gitmodules b/.gitmodules
index c14bb9c5..5f24276d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -33,3 +33,6 @@
 [submodule "third_party/mbedtls"]
 	path = third_party/mbedtls
 	url = https://github.com/ARMmbed/mbedtls
+[submodule "json"]
+	path = json
+	url = https://github.com/nlohmann/json
diff --git a/json b/json
new file mode 160000
index 00000000..6af826d0
--- /dev/null
+++ b/json
@@ -0,0 +1 @@
+Subproject commit 6af826d0bdb55e4b69e3ad817576745335f243ca