diff --git a/.readthedocs.yml b/.readthedocs.yml
index a23ccf0..01cf14d 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -8,7 +8,7 @@ version: 2
 build:
   os: ubuntu-lts-latest
   tools:
-    python: 3.8
+    python: "3.8"
 
 sphinx:
   fail_on_warning: false