diff --git a/.readthedocs.yml b/.readthedocs.yml
index ca885ac0cb0499f277e19fb9122ef4a733640acf..377551c80f3898a26dd750460d28d8415606f63f 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -5,10 +5,10 @@
 version: 2
 
 build:
-  image: testing
+  tools:
+    python: "3.9"
 
 python:
-  version: 3.9
   install:
     - requirements: docs/requirements.txt
     - method: pip
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3dadde5e70dbd2533b602588847641aee9d99604..66de40aa3015061b57a4158f2a7e9fbc251ee084 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,5 @@
 sphinx_rtd_theme
 sphinx_autodoc_typehints
 sphinxcontrib_bibtex
-sphinx_gallery
\ No newline at end of file
+sphinx_gallery
+psimpy
\ No newline at end of file