diff --git a/.gitmodules b/.gitmodules
index 6e4fd36..e69de29 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +0,0 @@
-[submodule "shadowsocks-csharp/simple-json"]
-	path = shadowsocks-csharp/simple-json
-	url = git@github.com:facebook-csharp-sdk/simple-json.git
diff --git a/shadowsocks-csharp/simple-json b/shadowsocks-csharp/simple-json
deleted file mode 160000
index 6b632fd..0000000
--- a/shadowsocks-csharp/simple-json
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 6b632fd304736788227e709b87e5bcf59bb4911d