diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 9c90c39..ceaffea 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -27,7 +27,6 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install --upgrade setuptools
         python -m pip install flake8 pytest
     - name: Install package
       run: |
diff --git a/.gitignore b/.gitignore
index 42345c4..2bef6c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,20 +1,22 @@
 *.pyc
 .DS_Store
 .coverage
+coverage.xml
+src/gaiaxpy/_version.py
+tox.ini
+query_tests.py
 .eggs/
 .env/
 .env10/
 .idea/
 .pytest_cache/
 .svn/
-GaiaXPy.egg-info/
+.tox/
 __pycache__/
 build/
 dist/
 docs/_build/
+GaiaXPy.egg-info/
 htmlcov/
 junit/
-src/gaiaxpy/_version.py
 tests_output_files/
-coverage.xml
-query_tests.py
diff --git a/pyproject.toml b/pyproject.toml
index 3a52b71..68bea25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = 'setuptools.build_meta'
 name = 'GaiaXPy'
 dependencies = [
   'aenum',
-  'astropy',
+  'astropy<=6.1.7',
   'astroquery',
   'fastavro',
   'hdfs',
diff --git a/src/gaiaxpy/file_parser/cast.py b/src/gaiaxpy/file_parser/cast.py
index aab826a..a092bd3 100644
--- a/src/gaiaxpy/file_parser/cast.py
+++ b/src/gaiaxpy/file_parser/cast.py
@@ -65,7 +65,7 @@ def _cast(df):
         except KeyError:
             continue  # Not every key is available in every case
         except ValueError as err:
-            if np.isnan(np.sum(df[column].values)):
+            if df[column].isna().any():
                 pass  # There can be nan values, do nothing with them at this step
             else:
                 # This is an actual error