diff --git a/acstools/tests/test_wfc_destripe.py b/acstools/tests/test_wfc_destripe.py
index 67e08e38..533fb73b 100644
--- a/acstools/tests/test_wfc_destripe.py
+++ b/acstools/tests/test_wfc_destripe.py
@@ -26,7 +26,9 @@ def _destripe_one(self, inputfile, outsuffix, outputfile, truthfile,
                                mask1=masks[0], mask2=masks[1])
 
         # Compare results
-        self.compare_outputs([(outputfile, truthfile)], rtol=1e-6)
+        # NOTE: atol instead of rtol was set due to numpy 2.0,
+        # see https://github.com/spacetelescope/acstools/issues/184
+        self.compare_outputs([(outputfile, truthfile)], atol=0.01)
 
     # jb5g05ubq = calibrated post-SM4 WFC full-frame exposures without masks
     # ja0x03ojq = calibrated polarizer WFC subarray exposures
diff --git a/acstools/tests/test_wfc_findsat_mrt.py b/acstools/tests/test_wfc_findsat_mrt.py
index e7045f7e..743908b3 100644
--- a/acstools/tests/test_wfc_findsat_mrt.py
+++ b/acstools/tests/test_wfc_findsat_mrt.py
@@ -1,11 +1,14 @@
 '''Test satellite trail detection and masking using findsat_mrt.'''
 import os
 
+import pytest
 from astropy.io.fits import FITSDiff
 from astropy.utils.data import get_pkg_data_filename
 
 from acstools.findsat_mrt import WfcWrapper
 
+pytest.importorskip("skimage")
+
 
 def test_WfcWrapper(tmp_path):
     """Identify and mask trails in WFC extension 4."""
diff --git a/acstools/tests/test_wfc_satdet.py b/acstools/tests/test_wfc_satdet.py
index 90d72649..1434095f 100644
--- a/acstools/tests/test_wfc_satdet.py
+++ b/acstools/tests/test_wfc_satdet.py
@@ -3,10 +3,14 @@
 .. note:: Cannot test ``detsat()`` because PHT results change from run to run!
 
 """
+import pytest
+
 from acstools import satdet
 from acstools.utils_findsat_mrt import update_dq
 from acstools.tests.helpers import BaseACSTOOLS
 
+pytest.importorskip("skimage")
+
 
 class TestSatDet(BaseACSTOOLS):
     detector = 'wfc'
diff --git a/acstools/utils_findsat_mrt.py b/acstools/utils_findsat_mrt.py
index cdaa87a7..51637cd1 100644
--- a/acstools/utils_findsat_mrt.py
+++ b/acstools/utils_findsat_mrt.py
@@ -20,8 +20,8 @@
     from skimage import transform
     from skimage.transform._warps import warp
     from skimage._shared.utils import convert_to_float
-except ImportError:
-    warnings.warn('skimage not installed. MRT calculation will not work.')
+except ImportError as e:
+    warnings.warn(f'skimage not installed. MRT calculation will not work: {repr(e)}')
 
 # check for scipy
 try:
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 49448f25..d6a14d43 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -5,7 +5,7 @@ ACSTOOLS
 ########
 
 Software tools for
-`Advanced Camera for Surveys (ACS) <http://www.stsci.edu/hst/acs/>`_.
+`Advanced Camera for Surveys (ACS) <https://www.stsci.edu/hst/acs/>`_.
 
 Different ways to install the latest release of this package::
 
diff --git a/setup.cfg b/setup.cfg
index 555a3651..5cb16741 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -87,6 +87,8 @@ filterwarnings =
   # Ignore numpy 2.0 warning, see https://github.com/astropy/astropy/pull/15495
   # and https://github.com/scipy/scipy/pull/19275
   ignore:.*numpy\.core.*:DeprecationWarning
+  # Do not let broken scikit-image block the rest of test suite
+  ignore:skimage not installed
 
 [flake8]
 # Ignoring these for now:
diff --git a/tox.ini b/tox.ini
index b859d32f..a3e4ddeb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ envlist =
 passenv = HOME,CI,jref
 
 setenv =
-    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/liberfa/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 
 # Run the tests in a temporary directory to make sure that we don't import
 # package from the source tree
@@ -38,6 +38,7 @@ deps =
     devdeps: scipy>=0.0.dev0
     devdeps: matplotlib>=0.0.dev0
     devdeps: scikit-image>=0.0.dev0
+    devdeps: pyerfa>=0.0.dev0
     devdeps: astropy>=0.0.dev0
     devdeps: git+https://github.com/astropy/photutils.git
     devdeps: git+https://github.com/spacetelescope/ci_watson.git