diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..976d509
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "include/flatbuffers"]
+	path = include/flatbuffers
+	url = https://github.com/google/flatbuffers
+[submodule "include/abseil"]
+	path = include/abseil
+	url = https://github.com/abseil/abseil-cpp
diff --git a/include/abseil b/include/abseil
new file mode 160000
index 0000000..110a80b
--- /dev/null
+++ b/include/abseil
@@ -0,0 +1 @@
+Subproject commit 110a80b0f01e6c013529661b433dc3f9ffe1df66
diff --git a/include/flatbuffers b/include/flatbuffers
new file mode 160000
index 0000000..3b7d1e8
--- /dev/null
+++ b/include/flatbuffers
@@ -0,0 +1 @@
+Subproject commit 3b7d1e86b46e2e79715e0aab915e1ceaca958a8e