diff --git a/.gitmodules b/.gitmodules
index ef44119..602e297 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -112,3 +112,6 @@
 [submodule "vendor/nim-quic"]
 	path = vendor/nim-quic
 	url = https://github.com/vacp2p/nim-quic.git
+[submodule "vendor/nim-ngtcp2"]
+	path = vendor/nim-ngtcp2
+	url = https://github.com/vacp2p/nim-ngtcp2.git
diff --git a/vendor/nim-ngtcp2 b/vendor/nim-ngtcp2
new file mode 160000
index 0000000..6834f47
--- /dev/null
+++ b/vendor/nim-ngtcp2
@@ -0,0 +1 @@
+Subproject commit 6834f4756b6af58356ac9c4fef3d71db3c3ae5fe