diff --git a/tox.ini b/tox.ini
index e9c6f3f9..579a3d99 100644
--- a/tox.ini
+++ b/tox.ini
@@ -318,7 +318,7 @@ description = build documentation
 basepython = {[default]basepython}
 
 deps =
-    Sphinx==3.3.1
+    Sphinx==3.4.1
     sphinx-rtd-theme==0.5.0
 
 commands =
@@ -361,7 +361,7 @@ skip_install = True
 deps =
    check-manifest==0.45
    readme-renderer==28.0
-   twine==3.2.0
+   twine==3.3.0
 
 commands =
    check-manifest