diff --git a/doc/conf.py b/doc/conf.py
index e102bf7ae..10b565e31 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -61,9 +61,9 @@ copyright = "2023, Antoine Nguyen"  # NOQA:A001
 # built documents.
 #
 # The short X.Y version.
-version = "1.10"
+version = "2.2.0"
 # The full version, including alpha/beta/rc tags.
-release = "1.10.0"
+release = "2.2.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -107,7 +107,7 @@ pygments_style = "sphinx"
 
 on_rtd = os.environ.get("READTHEDOCS", None) == "True"
 if on_rtd:
-    html_theme = "default"
+    html_theme = "sphinx_rtd_theme"
 else:
     html_theme = "nature"
 
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 50ab59091..93c90e2cb 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1 +1,2 @@
 docutils<0.21
+sphinx_rtd_theme