diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index 8e78c674..3dbfd4e2 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -58,11 +58,6 @@ jobs:
             python: '3.11'
             toxenv: py11-test-devdeps
 
-          - name: Test building of Sphinx docs
-            os: ubuntu-latest
-            python: 3.x
-            toxenv: build_docs
-
     steps:
     - name: Checkout code
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index e69de29b..00000000
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 00000000..1c07ead6
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,26 @@
+version: 2
+
+build:
+  os: "ubuntu-22.04"
+  apt_packages:
+    - graphviz
+  tools:
+    python: "3.11"
+
+sphinx:
+  builder: html
+  configuration: docs/conf.py
+  fail_on_warning: true
+
+# Install regular dependencies.
+# Then, install special pinning for RTD.
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs
+
+# Optionally build your docs in additional formats such as PDF
+formats:
+   - pdf
diff --git a/.readthedocs.yml b/.readthedocs.yml
deleted file mode 100644
index 94ec54dc..00000000
--- a/.readthedocs.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-# .readthedocs.yml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-   configuration: docs/conf.py
-
-# Optionally build your docs in additional formats such as PDF
-formats:
-   - pdf
-
-build:
-  os: ubuntu-20.04
-  apt_packages:
-    - graphviz
-  tools:
-    python: "3.9"
-
-
-# Optionally set the version of Python and requirements required to build your docs
-python:
-  install:
-    - requirements: docs/rtd-pip-requirements
-    - method: pip
-      path: .
-      extra_requirements:
-        - docs
diff --git a/MANIFEST.in b/MANIFEST.in
index 21444f62..7743dc11 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,15 +2,11 @@ include LICENSE.rst
 include README.rst
 include CHANGES.rst
 
-include ez_setup.py
-include ah_bootstrap.py
+include pyproject.toml
 include setup.cfg
 
-recursive-include *.pyx *.c *.pxd
 recursive-include docs *
 recursive-include licenses *
-recursive-include cextern *
-recursive-include scripts *
 
 prune build
 prune docs/_build
diff --git a/docs/conf.py b/docs/conf.py
index a2817fbb..9cb27f53 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -64,12 +64,6 @@
 copyright = '{0}, {1}'.format(
     datetime.datetime.now().year, setup_cfg['author'])
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-__import__(project)
-package = sys.modules[project]
-
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
@@ -166,8 +160,7 @@
 ]
 
 # -- Resolving issue number to links in changelog -----------------------------
-github_issues_url = 'https://github.com/{0}/issues/'.format(setup_cfg['github_p\
-roject'])
+github_issues_url = 'https://github.com/astropy/astroplan/issues/'
 
 # -- Options for linkcheck output -------------------------------------------
 linkcheck_retry = 5
diff --git a/docs/rtd-pip-requirements b/docs/rtd-pip-requirements
deleted file mode 100644
index ea66e5e9..00000000
--- a/docs/rtd-pip-requirements
+++ /dev/null
@@ -1,7 +0,0 @@
-numpy >= 1.6
-matplotlib
-Cython
-astropy >= 5
-pytz
-astroquery
-sphinx-astropy