diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index b150a966a..f2b0657b4 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -17,6 +17,6 @@ submodules:
 python:
   version: 3.8
   install:
-    - requirements: requirements.txt
+    - requirements: doc/requirements.txt
     - method: setuptools
       path: .
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9a54370d6..69e61c109 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,2 @@
-sphinx>=1.3.0
-sphinx_rtd_theme
+sphinx==4.2.0
+sphinx_rtd_theme==1.0.0