Another attempt to fix.

kattni · kattni · commit 478f22affa2d · 2022-05-11T15:27:16.000-04:00
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -11,7 +11,7 @@ version: 2
 build:
   os: ubuntu-20.04
   tools:
-    python: "3.9"
+    python: "3"
 
 python:
   install:
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -4,3 +4,4 @@
 # SPDX-License-Identifier: MIT
 
 sphinx>=4.0.0
+pillow>=6.0.0
