diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6cbb823..9175482 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,16 +10,18 @@ jobs:
   ci:
     name: Run test suite
 
+    permissions:
+      contents: read
+
     runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
 
-      # - name: Install itspriddle/gh-shellcheck
-      #   env:
-      #     GH_TOKEN: ${{ github.token }}
-      #   run:
-      #     gh extension install itspriddle/gh-shellcheck
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
 
       - name: Run shellcheck
+        env:
+          GH_TOKEN: ${{ github.token }}
         run: |
-          ./gh-shellcheck
+          gh extension install .
+          gh shellcheck
diff --git a/README.md b/README.md
index cf5be80..ee770c9 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,10 @@ jobs:
     name: Run shellcheck
 
     runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
     steps:
       - uses: actions/checkout@v4