diff --git a/.readthedocs.yml b/.readthedocs.yml
index ae08fe7ee059c2..592c9da64e1cf5 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -20,7 +20,7 @@ formats: []
 sphinx:
     configuration: docs/rtd-deprecation/conf.py
 python:
-    version: 3.7
+    version: "3.7"
     install:
         - method: pip
           path: .