1 files changed, 4 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 41da75d..e027723 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 # Generated from:
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 [tox]
-minversion = 3.18
+minversion = 4.0
 envlist =
     lint
     py37,py37-pure
@@ -9,13 +9,16 @@ envlist =
     py39,py39-pure
     py310,py310-pure
     py311,py311-pure
+    py312,py312-pure
     pypy3
     docs
     coverage
 
 [testenv]
 usedevelop = true
+pip_pre = py312: true
 deps =
+    Sphinx
 setenv =
     pure: PURE_PYTHON=1
     !pure-!pypy3: PURE_PYTHON=0