diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 45645558..a5199fa5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,14 +15,17 @@ jobs:
         python-version: ["3.10","3.11"]
         platform: [ubuntu-latest, macos-latest, windows-latest]
         exclude:
-          # This case is handled in the coverage run
+          # This case is handled in the coverage/remote data run
           - python-version: "3.11"
             platform: ubuntu-latest
         include:
           # In the run on python 3.11 on ubuntu include running coverage
+          # and remote data. Do both tests together to get best coverage
+          # estimate.
           - python-version: "3.11"
             platform: ubuntu-latest
             coverage: true
+            toxposargs: --remote-data=any
 
     runs-on: ${{ matrix.platform }}
 
diff --git a/pyproject.toml b/pyproject.toml
index d724db2d..048faca1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,6 +129,7 @@ norecursedirs = [
 astropy_header = true
 doctest_plus = "enabled"
 text_file_format = "rst"
+remote_data_strict = true
 addopts = [
     "-ra",
     "--color=yes",
diff --git a/stellarphot/conftest.py b/stellarphot/conftest.py
index faacf46b..b34d0664 100644
--- a/stellarphot/conftest.py
+++ b/stellarphot/conftest.py
@@ -6,6 +6,10 @@
 
 
 def pytest_configure(config):
+    from astropy.utils.iers import conf as iers_conf
+
+    # Disable IERS auto download for testing
+    iers_conf.auto_download = False
 
     config.option.astropy_header = True
     PYTEST_HEADER_MODULES.pop('h5py', None)
@@ -15,16 +19,8 @@ def pytest_configure(config):
     TESTED_VERSIONS[packagename] = version
 
 
-# from astropy.tests.helper import enable_deprecations_as_exceptions
+def pytest_unconfigure(config):
+    from astropy.utils.iers import conf as iers_conf
 
-## Uncomment the following line to treat all DeprecationWarnings as
-## exceptions. For Astropy v2.0 or later, there are 2 additional keywords,
-## as follow (although default should work for most cases).
-## To ignore some packages that produce deprecation warnings on import
-## (in addition to 'compiler', 'scipy', 'pygments', 'ipykernel', and
-## 'setuptools'), add:
-##     modules_to_ignore_on_import=['module_1', 'module_2']
-## To ignore some specific deprecation warning messages for Python version
-## MAJOR.MINOR or later, add:
-##     warnings_to_ignore_by_pyver={(MAJOR, MINOR): ['Message to ignore']}
-# enable_deprecations_as_exceptions()
+    # Undo IERS auto download setting for testing
+    iers_conf.reset("auto_download")
diff --git a/stellarphot/io/tests/test_tess_submission.py b/stellarphot/io/tests/test_tess_submission.py
index 888f0f36..afb1233a 100644
--- a/stellarphot/io/tests/test_tess_submission.py
+++ b/stellarphot/io/tests/test_tess_submission.py
@@ -73,6 +73,7 @@ def test_valid_method():
     assert not tsub._valid()
 
 
+@pytest.mark.remote_data
 def test_target_file():
     # Getting the target information failed on windows, so the
     # first point of this test is to simply succeed in creating the
diff --git a/stellarphot/utils/tests/test_catalog_search.py b/stellarphot/utils/tests/test_catalog_search.py
index 4f8b39fe..35386d31 100644
--- a/stellarphot/utils/tests/test_catalog_search.py
+++ b/stellarphot/utils/tests/test_catalog_search.py
@@ -129,6 +129,7 @@ def test_in_frame():
     assert in_out[1]
 
 
+@pytest.mark.remote_data
 @pytest.mark.parametrize('clip, data_file',
                          [(True, 'data/clipped_ey_uma_vsx.fits'),
                           (False, 'data/unclipped_ey_uma_vsx.fits')])
@@ -153,6 +154,7 @@ def test_catalog_search(clip, data_file):
     assert all(actual['OID'] == expected['OID'])
 
 
+@pytest.mark.remote_data
 def test_find_known_variables():
     # Under the hood this calls catalog search on the VSX
     # catalog and clips to the frame.
@@ -175,6 +177,7 @@ def test_find_known_variables():
     assert expected['Name'] == vsx['Name']
 
 
+@pytest.mark.remote_data
 def test_catalog_search_from_wcs_or_coord():
     data_file = 'data/sample_wcs_ey_uma.fits'
     data = get_pkg_data_filename(data_file)
@@ -221,6 +224,7 @@ def test_catalog_search_with_coord_and_frame_clip_fails():
     assert 'To clip entries by frame' in str(e.value)
 
 
+@pytest.mark.remote_data
 def test_find_apass():
     # This is really checking from APASS DR9 on Vizier, or at least that
     # is where the "expected" data is drawn from.