diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3dadde5e70dbd2533b602588847641aee9d99604..be15581a27189321527b1537d1bd78cc5f41ee88 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 # readthedocs build fails due to R_HOME
\ No newline at end of file