diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..8cedb7b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "third_party/mruby"]
+	path = third_party/mruby
+	url = https://github.com/mruby/mruby
+	branch = stable
diff --git a/third_party/mruby b/third_party/mruby
new file mode 160000
index 0000000..31ea493
--- /dev/null
+++ b/third_party/mruby
@@ -0,0 +1 @@
+Subproject commit 31ea49319abaaf656e038f33053948e29e7e75f9