diff --git a/.gitmodules b/.gitmodules
index 49b2b33e7..855ea5ab2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,3 +22,4 @@
 [submodule "external/pybind11"]
 	path = external/pybind11
 	url = https://github.com/pybind/pybind11
+	branch = stable