diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 33c2a61..88bca9f 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -8,6 +8,9 @@
 # Required
 version: 2
 
+sphinx:
+  configuration: docs/conf.py
+
 build:
   os: ubuntu-20.04
   tools:
diff --git a/adafruit_bus_device/spi_device.py b/adafruit_bus_device/spi_device.py
index 7b62649..ea8515e 100644
--- a/adafruit_bus_device/spi_device.py
+++ b/adafruit_bus_device/spi_device.py
@@ -89,7 +89,7 @@ def __init__(
         self.chip_select = chip_select
         self.cs_active_value = cs_active_value
         if self.chip_select:
-            self.chip_select.switch_to_output(value=True)
+            self.chip_select.switch_to_output(value=not self.cs_active_value)
 
     def __enter__(self) -> SPI:
         while not self.spi.try_lock():
diff --git a/docs/conf.py b/docs/conf.py
index 3103fd4..61daef1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -104,7 +104,6 @@
 import sphinx_rtd_theme
 
 html_theme = "sphinx_rtd_theme"
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), "."]
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 797aa04..979f568 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,5 +2,6 @@
 #
 # SPDX-License-Identifier: Unlicense
 
-sphinx>=4.0.0
+sphinx
 sphinxcontrib-jquery
+sphinx-rtd-theme