diff --git a/.gitmodules b/.gitmodules
index fa66c6c..6fa9e44 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "themes/hugo-theme-stack"]
 	path = themes/hugo-theme-stack
-	url = https://github.com/CaiJimmy/hugo-theme-stack/
\ No newline at end of file
+	url = https://github.com/CaiJimmy/hugo-theme-stack
diff --git a/themes/hugo-theme-stack b/themes/hugo-theme-stack
new file mode 160000
index 0000000..405e842
--- /dev/null
+++ b/themes/hugo-theme-stack
@@ -0,0 +1 @@
+Subproject commit 405e84291aaa89dd2e642d9781b63bc8f37aa70a