diff --git a/.gitmodules b/.gitmodules
index c152e9e774..f4785955af 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -36,3 +36,6 @@
 [submodule "lib/nxp_driver"]
 	path = lib/nxp_driver
 	url = https://github.com/hathach/nxp_driver.git
+[submodule "lib/libhydrogen"]
+	path = lib/libhydrogen
+	url = https://github.com/jedisct1/libhydrogen.git
diff --git a/lib/libhydrogen b/lib/libhydrogen
new file mode 160000
index 0000000000..5c5d513093
--- /dev/null
+++ b/lib/libhydrogen
@@ -0,0 +1 @@
+Subproject commit 5c5d513093075f7245ea522101b17c50aa579af2