diff --git a/.readthedocs.yml b/.readthedocs.yml
index 559092b..d744672 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -16,6 +16,6 @@ build:
 
 # 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