diff --git a/docs/environment.yml b/docs/environment.yml
deleted file mode 100644
index 2529353f0..000000000
--- a/docs/environment.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-# Conda environment configuration for readthedocs
-
-name: rtdenv
-dependencies:
-  - python=3.9
-  - sphinx
-  # https://stackoverflow.com/questions/67542699/readthedocs-sphinx-not-rendering-bullet-list-from-rst-fileA
-  - docutils==0.16
diff --git a/docs/source/conf.py b/docs/source/conf.py
index ae4ea5253..b76f52c9f 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -15,10 +15,9 @@
 
 import sys
 import os
-import shlex
 from datetime import datetime
 
-on_rtd = os.environ.get('READTHEDOCS') == 'True'
+import sphinx_rtd_theme
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -58,9 +57,10 @@
 copyright = '2015, Continuum Analytics'
 author = 'Continuum Analytics'
 
-if on_rtd:
+if os.environ.get('READTHEDOCS'):
     # RTD replaces the last update date.  So we need to hack it in here.
-    copyright += '. Last updated on {}'.format(datetime.utcnow().strftime('%b %d, %Y'))
+    copyright += '. Last updated on {}'.format(
+        datetime.utcnow().strftime('%b %d, %Y'))
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -121,18 +121,9 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
-
-# on_rtd is whether we are on readthedocs.org
-on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
-
-if not on_rtd:
-    # only import and set the theme if we're building docs locally
-    # otherwise, readthedocs.org uses their theme by default, so no need to specify it
-    import sphinx_rtd_theme
-    html_theme = 'sphinx_rtd_theme'
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
+html_theme = 'sphinx_rtd_theme'
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
diff --git a/readthedocs.yml b/readthedocs.yml
deleted file mode 100644
index 0798c1333..000000000
--- a/readthedocs.yml
+++ /dev/null
@@ -1,5 +0,0 @@
-# Configuration file for readthedocs
-# See https://read-the-docs.readthedocs.org/en/latest/yaml-config.html
-
-conda:
-    file: docs/environment.yml
diff --git a/setup.py b/setup.py
index 75150ea4b..d327e5ce0 100644
--- a/setup.py
+++ b/setup.py
@@ -42,9 +42,6 @@ def _guard_py_ver():
 
 _guard_py_ver()
 
-if os.environ.get('READTHEDOCS', None) == 'True':
-    sys.exit("setup.py disabled on readthedocs: called with %s"
-             % (sys.argv,))
 
 import versioneer