diff --git a/.gitmodules b/.gitmodules
index 401bb2b..27501b1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -26,10 +26,6 @@
 	path = examples/keyword/cpplint/sillycode
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
 	branch = keyword/cpplint/sillycode
-[submodule "examples/clangtidy/sillycode"]
-	path = examples/clangtidy/sillycode
-	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
-	branch = clangtidy/sillycode
 [submodule "examples/keyword/clangtidy/sillycode"]
 	path = examples/keyword/clangtidy/sillycode
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
diff --git a/examples/clangtidy/sillycode b/examples/clangtidy/sillycode
deleted file mode 160000
index 54dbb6b..0000000
--- a/examples/clangtidy/sillycode
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 54dbb6b544e77f97d1b72bdd3e6601ce6ab1c3b4