diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df8a358..e798877 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,3 +31,19 @@ jobs:
 
       - name: Run linting
         run: ruff check regex_humanizer/ tests/
+
+  i18n-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install i18n-key-sync
+        run: pip install -e .
+
+      - name: Validate i18n keys
+        run: i18n-key-sync validate ./i18n_key_sync --strict