diff --git a/tox.ini b/tox.ini
index b725f400e8..70a84daecc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -48,6 +48,9 @@ deps = {[testenv:py36]deps}
 [testenv:py38]
 deps = {[testenv:py36]deps}
 
+[testenv:py39]
+deps = {[testenv:py36]deps}
+
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}
 
@@ -61,11 +64,13 @@ commands =
   ./.manpages {posargs}
 
 [testenv:func]
+deps = {[testenv:py36]deps}
 allowlist_externals =
   ./.functests
 commands = ./.functests {posargs}
 
 [testenv:func-ec]
+deps = {[testenv:py36]deps}
 allowlist_externals =
   ./.functests
 commands = ./.functests {posargs}