diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000..89198da65
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "external/googletest"]
+	path = external/googletest
+	url = https://github.com/google/googletest
+	branch = release-1.10.0
diff --git a/external/googletest b/external/googletest
new file mode 160000
index 000000000..703bd9caa
--- /dev/null
+++ b/external/googletest
@@ -0,0 +1 @@
+Subproject commit 703bd9caab50b139428cea1aaff9974ebee5742e