diff --git a/.rtd-environment.yml b/.rtd-environment.yml
index 97449a5a17..b3f4c7dc70 100644
--- a/.rtd-environment.yml
+++ b/.rtd-environment.yml
@@ -6,3 +6,4 @@ dependencies:
     - python>=3
     - numpy
     - scipy
+    - requests==2.20