diff --git a/readthedocs.yml b/readthedocs.yml
index 91ce59d5..cd810583 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -2,7 +2,7 @@
 version: 2
 
 python:
-  version: 3.7
+  version: 3.6
 
 mkdocs:
   configuration: mkdocs.yml