diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 5aa479f0..3e2ac6f1 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,3 +7,7 @@ build:
 
 sphinx:
   configuration: doc/source/conf.py
+
+python:
+  install:
+    - requirements: docs/requirements.txt
diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 00000000..483a4e96
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1 @@
+sphinx_rtd_theme