diff --git a/.readthedocs.yml b/.readthedocs.yml
index 4d19e84..a373018 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -8,3 +8,4 @@ python:
   install:
     - method: pip
       path: .
+    - requirements: docs/requirements.txt
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..48d3b83
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1 @@
+Sphinx<7