diff --git a/.github/workflows/linters.yml b/.github/workflows/linters.yml
index 77a25433ca..e24733172e 100644
--- a/.github/workflows/linters.yml
+++ b/.github/workflows/linters.yml
@@ -27,7 +27,8 @@ jobs:
           python-version: '3.10'
       - run: python -m pip install flake8
       - name: flake8
-        uses: liskin/gh-problem-matcher-wrap@v1
+        # Pinned to v1.0.1.
+        uses: liskin/gh-problem-matcher-wrap@d9e345a28ab1eeb00c349e8bb199a102aa58acba
         with:
           linters: flake8
           run: flake8
@@ -43,7 +44,8 @@ jobs:
           python-version: '3.10'
       - run: python -m pip install isort
       - name: isort
-        uses: liskin/gh-problem-matcher-wrap@v1
+        # Pinned to v1.0.1.
+        uses: liskin/gh-problem-matcher-wrap@d9e345a28ab1eeb00c349e8bb199a102aa58acba
         with:
           linters: isort
           run: isort --check --diff django tests scripts