diff --git a/.gitmodules b/.gitmodules
index 301b5b3c..0e373ee4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "third-party/mruby"]
 	path = third-party/mruby
 	url = https://github.com/mruby/mruby
+[submodule "third-party/neverbleed"]
+	path = third-party/neverbleed
+	url = https://github.com/h2o/neverbleed.git
diff --git a/third-party/neverbleed b/third-party/neverbleed
new file mode 160000
index 00000000..3d567817
--- /dev/null
+++ b/third-party/neverbleed
@@ -0,0 +1 @@
+Subproject commit 3d56781771a60a9c343e2b80849d81992c925779