diff --git a/.gitmodules b/.gitmodules
index fef77ae..d62e72d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -66,10 +66,6 @@
 	path = examples/healthcheck/repoverify
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
 	branch = healthcheck/repoverify
-[submodule "examples/cppcheck/sillycode"]
-	path = examples/cppcheck/sillycode
-	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
-	branch = cppcheck/sillycode
 [submodule "examples/keyword/script"]
 	path = examples/keyword/script
 	url = ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/JOJ3-examples.git
diff --git a/README.md b/README.md
index 864aad3..e8ab027 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,6 @@ For now, the following checking tools are needed for test:
 3. `cmake`
 4. `make`
 5. `cpplint`
-6. `cppcheck`
 
 ```bash
 $ make test
diff --git a/examples/cppcheck/sillycode b/examples/cppcheck/sillycode
deleted file mode 160000
index 97081f2..0000000
--- a/examples/cppcheck/sillycode
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 97081f27ad689b87eec4632086664435fa82ec5e