diff --git a/.gitmodules b/.gitmodules
index ab627b9..0cb77d1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "docs/demo_notebooks"]
 	path = docs/demo_notebooks
-	url = git@github.com:cchdo/demo_notebooks.git
+	url = https://github.com/cchdo/demo_notebooks.git