diff --git a/README.md b/README.md
index 1d26c395..979d205e 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 ## About
 Grid is a simple, free, and open-source Python library for numerical integration, interpolation and differentiation.
-Primarly intended for the quantum chemistry community to assist in density-functional (DFT) theory calculations,
+Primarily intended for the quantum chemistry community to assist in density-functional (DFT) theory calculations,
 including support for periodic boundary conditions.
 
 Please visit [**Grid Documentation**](https://grid.qcdevs.org/) for more information with
diff --git a/pyproject.toml b/pyproject.toml
index 9ba1edde..01b3daed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,9 +50,9 @@ doc = [
     "sphinx-autoapi",
     "nbsphinx",
     "nbconvert",
-    "sphinx_rtd_theme",
+    "sphinx-rtd-theme>=3.0.0rc1",
     "sphinx_autodoc_typehints",
-    "docutils==0.16",  # Needed to show bullet points in sphinx_rtd_theme
+    "docutils >0.18,<0.22",  # Compatible with modern Sphinx versions
     "nbsphinx-link"
 ]