diff --git a/docs/rtd_environment.yml b/docs/rtd_environment.yml
index 77c38ebed..be919653e 100644
--- a/docs/rtd_environment.yml
+++ b/docs/rtd_environment.yml
@@ -25,7 +25,7 @@ dependencies:
   - scipy
   - patsy
   - joblib
-  - plotly
+  - plotly<=5.18
   - ipython
   - pip:
       - ../