diff --git a/.gitmodules b/.gitmodules
index f835204..5607cbc 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "themes/hugo-theme-flat"]
 	path = themes/hugo-theme-flat
 	url = https://cgit.leafee98.com/hugo-theme-flat.git/
+	branch = main
diff --git a/themes/hugo-theme-flat b/themes/hugo-theme-flat
index 4e73d5d..3b58a1a 160000
--- a/themes/hugo-theme-flat
+++ b/themes/hugo-theme-flat
@@ -1 +1 @@
-Subproject commit 4e73d5d1eb6f2d0d0cd375b422e60fd22077a29d
+Subproject commit 3b58a1a279b90dbab2b83aed7403cd69d1fde157