diff --git a/.readthedocs.yml b/.readthedocs.yml
index 4f5e2976..0b154b61 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -14,7 +14,7 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
+  version: "3.7"
   install:
     - requirements: docs/requirements.txt