diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eedebbe..889acea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,6 +40,7 @@ jobs:
         run: ci/mypy.sh
 
       - name: shellcheck
+        uses: actions/checkout@v4
         run: ci/shellcheck.sh
 
       - name: format
diff --git a/ci/shellcheck.sh b/ci/shellcheck.sh
index 8816ac7..819ec48 100755
--- a/ci/shellcheck.sh
+++ b/ci/shellcheck.sh
@@ -24,4 +24,4 @@ echo "${shell_files[@]}" | tr ' ' '\n' | sed 's/^/    /'
 
 echo
 
-/usr/local/bin/shellcheck --external-sources "${shell_files[@]}"
+shellcheck --external-sources "${shell_files[@]}"