diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..a3fde4de
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "testssl.sh"]
+	path = testssl.sh
+	url = https://github.com/drwetter/testssl.sh.git
+	branch = 2.9.5
diff --git a/testssl.sh b/testssl.sh
new file mode 160000
index 00000000..727a2888
--- /dev/null
+++ b/testssl.sh
@@ -0,0 +1 @@
+Subproject commit 727a2888d6d928411ab4882cbc026e6d3f6cd49d