[requires.io] dependency update

requires · requires · commit bbbdebe69f13 · 2020-06-27T17:00:15.000-07:00
diff --git a/tox.ini b/tox.ini
@@ -318,7 +318,7 @@ description = build documentation
 basepython = {[default]basepython}
 
 deps =
-    Sphinx==2.4.4
+    Sphinx==3.1.1
     sphinx-rtd-theme==0.5.0
 
 commands =
