diff --git a/.gitmodules b/.gitmodules
index 2cd4c06c0..49b2b33e7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,3 +19,6 @@
 [submodule "external/date"]
 	path = external/date
 	url = https://github.com/HowardHinnant/date.git
+[submodule "external/pybind11"]
+	path = external/pybind11
+	url = https://github.com/pybind/pybind11
diff --git a/external/pybind11 b/external/pybind11
new file mode 160000
index 000000000..4f72ef846
--- /dev/null
+++ b/external/pybind11
@@ -0,0 +1 @@
+Subproject commit 4f72ef846fe8453596230ac285eeaa0ce3278bb4