diff --git a/.readthedocs.yml b/.readthedocs.yml
index e1522f3..2b62212 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -26,6 +26,6 @@ sphinx:
   fail_on_warning: true
 
 python:
-  version: 3.7
+  version: "3.7"
   install:
     - requirements: docs/requirements.txt