diff --git a/.github/workflows/openconcept.yaml b/.github/workflows/openconcept.yaml
index 98b920f9..8eb10cd0 100644
--- a/.github/workflows/openconcept.yaml
+++ b/.github/workflows/openconcept.yaml
@@ -89,6 +89,31 @@ jobs:
       run: |
         python -m pytest --cov-config=.coveragerc --cov=openconcept --cov-report=xml
 
+    - name: Test if engine deck data is included in package
+      if: ${{ matrix.os == 'ubuntu-latest' && matrix.dep-versions == 'latest' }}
+      run: |
+        # Build the wheel and source distribution
+        pip install build setuptools wheel
+        python -m build
+
+        # Create a fresh venv to simulate a clean install
+        python -m venv venv_test_pkg
+        source venv_test_pkg/bin/activate
+
+        # Install the wheel, not in editable mode
+        pip install dist/openconcept-*.whl
+
+        # Check that the .npy files are installed
+        python - <<'PYCODE'
+        import importlib.resources as r
+        import pathlib
+
+        files = list(pathlib.Path(r.files('openconcept.propulsion.empirical_data')).rglob('*.npy'))
+        if not files:
+            raise SystemExit('No .npy files found in installed package!')
+        print(f'Found {len(files)} .npy data files.')
+        PYCODE
+
     - name: Upload coverage to Codecov
       if: ${{ matrix.os == 'ubuntu-latest' }}
       uses: codecov/codecov-action@v4
diff --git a/readme.md b/README.md
similarity index 100%
rename from readme.md
rename to README.md
diff --git a/openconcept/__init__.py b/openconcept/__init__.py
index b7e19904..64c7d51e 100644
--- a/openconcept/__init__.py
+++ b/openconcept/__init__.py
@@ -1 +1 @@
-__version__ = "1.2.5"
+__version__ = "1.2.6"
diff --git a/setup.py b/setup.py
index 97ad2b67..7081b8f7 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 )[0]
 
 this_directory = os.path.abspath(os.path.dirname(__file__))
-with open(os.path.join(this_directory, "readme.md"), encoding="utf-8") as f:
+with open(os.path.join(this_directory, "README.md"), encoding="utf-8") as f:
     long_description = f.read()
 
 setup(
@@ -37,6 +37,11 @@
     download_url="https://github.com/mdolab/openconcept",
     license="MIT License",
     packages=find_packages(include=["openconcept*"]),
+    package_data={
+        # engine deck data
+        "openconcept.propulsion.empirical_data": ["**/*.npy"],
+    },
+    include_package_data=True,
     install_requires=[
         # Update the oldest package versions in the GitHub Actions build file, the readme,
         # and the index.rst file in the docs when you change these