diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6e67c74..155db90 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -50,7 +50,18 @@ jobs:
       - run: pip install -c .github/test-constraints.txt '.[test]'
       - run: pytest --cov=heracles --cov-report=lcov
       - uses: coverallsapp/github-action@v2
-
+      - name: Cache data for Notebook tests
+        id: cache-data
+        uses: actions/cache@v4
+        with:
+          path: ./examples
+          key: ${{ runner.os }}-data-${{ github.run_number }}-${{ hashFiles('catalog.fits') }}
+          restore-keys: |
+            ${{ runner.os }}-data
+      - run: pip install jupyter pipx
+      - run: pipx runpip install numpy matplotlib ducc0 healpy
+      - run: pipx run jupyter execute examples/example.ipynb
+      
   build:
     name: Build
     runs-on: ubuntu-latest
diff --git a/heracles/healpy.py b/heracles/healpy.py
index 7fd0912..5290f02 100644
--- a/heracles/healpy.py
+++ b/heracles/healpy.py
@@ -48,7 +48,7 @@ def wrapper(*args):
         newargs = []
         for arr in args:
             if arr.dtype.byteorder != "=":
-                arr = arr.newbyteorder("=").byteswap()
+                arr = arr.view(arr.dtype.newbyteorder('=')).byteswap()
             newargs.append(arr)
         return fn(*newargs)