diff --git a/.github/workflows/tex-tests.yml b/.github/workflows/tex-tests.yml
index 5d9d4e9..ac188bf 100644
--- a/.github/workflows/tex-tests.yml
+++ b/.github/workflows/tex-tests.yml
@@ -10,7 +10,7 @@ on:
   schedule:
     # Weekly Monday 4 AM build
     # * is a special character in YAML so you have to quote this string
-    - cron: '0 1 * * 1'
+    - cron: '0 4 * * 1'
 
 jobs:
 
@@ -27,16 +27,16 @@ jobs:
         # For example -- os: [ubuntu-latest, macos-latest, windows-latest]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
-        # Test python 3.8, 3.9, and 3.10 by default.
-        python-ver: [8, 9, 10]
+        # Test python version 3.x
+        python-ver: [9, 10, 11]
 
         # Specify which tox environments to test in this list.
         # tox-env: [cov, alldeps, devdeps, astropylts]
         tox-env: [alldeps]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up python 3.${{ matrix.python-ver }} with tox environment py3${{ matrix.python-ver }}-${{ matrix.tox-env }} on ${{ matrix.os }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: 3.${{ matrix.python-ver }}
     - name: Install base dependencies
@@ -48,58 +48,58 @@ jobs:
         tox -e py3${{ matrix.python-ver }}-${{ matrix.tox-env }}
 
   # Dev version test
-  dev_test:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, '[ci skip]')"
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up python for astropy, numpy dev test
-      uses: actions/setup-python@v3
-      with:
-        python-version: '3.10'
-    - name: Install base dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install tox
-    - name: Test with tox
-      run: |
-        tox -e py310-devdeps
+  # dev_test:
+  #   runs-on: ubuntu-latest
+  #   if: "!contains(github.event.head_commit.message, '[ci skip]')"
+  #   steps:
+  #   - uses: actions/checkout@v4
+  #   - name: Set up python for astropy, numpy dev test
+  #     uses: actions/setup-python@v4
+  #     with:
+  #       python-version: 3.8
+  #   - name: Install base dependencies
+  #     run: |
+  #       python -m pip install --upgrade pip
+  #       python -m pip install tox
+  #   - name: Test with tox
+  #     run: |
+  #       tox -e py38-devdeps
 
   # LTS version test
   lts_test:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up python for astropy lts test
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: 3.9
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install tox
     - name: Test with tox
       run: |
-        tox -e py310-astropylts
+        tox -e py39-astropylts
 
   # Coverage test
   cov_test:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up python for coverage test
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: 3.11
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install tox
     - name: Test with tox
       run: |
-        tox -e py310-cov
+        tox -e py311-cov
     - name: Upload coverage to codecov
       uses: codecov/codecov-action@v1
       with:
@@ -118,11 +118,11 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python to build docs with sphinx
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: 3.11
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
@@ -131,24 +131,6 @@ jobs:
     - name: Build and check docs using tox
       run: |
         tox -e build_docs
-
-  # Test building of docs and check the links
-  link_test:
-    runs-on: ubuntu-latest
-    if: "!contains(github.event.head_commit.message, '[ci skip]')"
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python to build docs with sphinx
-      uses: actions/setup-python@v3
-      with:
-        python-version: '3.10'
-    - name: Install base dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install tox
-        sudo apt-get install graphviz
-    - name: Build and check docs using tox
-      run: |
         tox -e linkcheck
 
   # Perform codestyle check
@@ -156,11 +138,11 @@ jobs:
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Python codestyle check
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: 3.11
     - name: Install base dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 91be621..8b77653 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,10 +1,11 @@
 version: 2
 
 build:
-  image: latest
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
 
 python:
-  version: 3.7
   install:
     - method: pip
       path: .
@@ -12,4 +13,6 @@ python:
         - docs
         - all
 
+# Don't build any extra formats
 formats: []
+
diff --git a/docs/index.rst b/docs/index.rst
index 1f54f0e..21352c0 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -81,7 +81,7 @@ fixes, code, or documentation (no git or GitHub experience necessary):
 
 * `Coding Guidelines <https://docs.astropy.org/en/latest/development/codeguide.html>`_
 
-* `Developer Documentation <https://docs.astropy.org/en/latest/#developer-documentation>`_
+* `Developer Documentation <https://docs.astropy.org/en/latest/index_dev.html>`_
 
 For the complete list of contributors please see the `pahfit
 contributors page on Github
diff --git a/pahfit/__init__.py b/pahfit/__init__.py
index 65b8d0e..3d7d5e3 100644
--- a/pahfit/__init__.py
+++ b/pahfit/__init__.py
@@ -1,9 +1,6 @@
-# Licensed under a 3-clause BSD style license - see LICENSE.rst
+from importlib.metadata import version as _version, PackageNotFoundError
 
-# Packages may add whatever they like to this file, but
-# should keep this content at the top.
-# ----------------------------------------------------------------------------
-from ._astropy_init import *   # noqa
-# ----------------------------------------------------------------------------
-
-__all__ = []
+try:
+    __version__ = _version(__name__)
+except PackageNotFoundError:  # pragma: no cover
+    pass
diff --git a/pahfit/_astropy_init.py b/pahfit/_astropy_init.py
deleted file mode 100644
index 0a9f253..0000000
--- a/pahfit/_astropy_init.py
+++ /dev/null
@@ -1,55 +0,0 @@
-# Licensed under a 3-clause BSD style license - see LICENSE.rst
-
-__all__ = ["__version__"]
-
-# this indicates whether or not we are in the package's setup.py
-try:
-    _ASTROPY_SETUP_
-except NameError:
-    import builtins
-
-    builtins._ASTROPY_SETUP_ = False
-
-try:
-    from .version import version as __version__
-except ImportError:
-    __version__ = ""
-
-
-if not _ASTROPY_SETUP_:  # noqa
-    import os
-    from warnings import warn
-    from astropy.config.configuration import (
-        update_default_config,
-        ConfigurationDefaultMissingError,
-        ConfigurationDefaultMissingWarning,
-    )
-
-    # Create the test function for self test
-    from astropy.tests.runner import TestRunner
-
-    test = TestRunner.make_test_runner_in(os.path.dirname(__file__))
-    test.__test__ = False
-    __all__ += ["test"]
-
-    # add these here so we only need to cleanup the namespace at the end
-    config_dir = None
-
-    if not os.environ.get("ASTROPY_SKIP_CONFIG_UPDATE", False):
-        config_dir = os.path.dirname(__file__)
-        config_template = os.path.join(config_dir, __package__ + ".cfg")
-        if os.path.isfile(config_template):
-            try:
-                update_default_config(__package__, config_dir, version=__version__)
-            except TypeError as orig_error:
-                try:
-                    update_default_config(__package__, config_dir)
-                except ConfigurationDefaultMissingError as e:
-                    wmsg = (
-                        e.args[0] + " Cannot install default profile. If you are "
-                        "importing from source, this is expected."
-                    )
-                    warn(ConfigurationDefaultMissingWarning(wmsg))
-                    del e
-                except Exception:
-                    raise orig_error
diff --git a/tox.ini b/tox.ini
index a3724c5..76c9b5d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,6 @@
 [tox]
 envlist =
-    py{38,39,310}-test{,-alldeps,-devdeps}{,-cov}
-    py{38,39,310}-test-numpy{118,119,120,121}
-    py{38,39,310}-test-astropy{40,50}
+    py{39,310,311}-test{,-alldeps}{,-cov}
     build_docs
     linkcheck
     codestyle
@@ -36,27 +34,13 @@ description =
     devdeps: with the latest developer version of key dependencies
     oldestdeps: with the oldest supported version of key dependencies
     cov: and test coverage
-    numpy118: with numpy 1.18.*
-    numpy119: with numpy 1.19.*
-    numpy120: with numpy 1.20.*
-    numpy121: with numpy 1.21.*
-    astropy40: with astropy 4.0.*
-    astropy50: with astropy 5.0.*
     astropylts: with the latest astropy LTS (currently v5.0)
 
 # The following provides some specific pinnings for key packages
 deps =
-
-    numpy118: numpy==1.18.*
-    numpy119: numpy==1.19.*
-    numpy120: numpy==1.20.*
-    numpy121: numpy==1.21.*
-
-    astropy40: astropy==4.0.*
-    astropy50: astropy==5.0.*
     astropylts: astropy==5.0.*
 
-    devdeps: git+https://github.com/astropy/astropy.git#egg=astropy
+    devdeps: PIP_EXTRA_INDEX_URL=https://pypi.anaconda.org/scipy-wheels-nightly/simple
 
 # The following indicates which extras_require from setup.cfg will be installed
 extras =