diff --git a/tox.ini b/tox.ini
index 5f9fa7ca6..5c94223e4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist =
     # Python 2.7 support was removed in Sphinx 2
     py{27}-sphinx{17,18}{-html4,-html5,}{-qa,}
-    py{36,37,38,39}-sphinx{17,18,20,21,22,23,24,30,31,32,33,34,35,40,41,42,43,44,45,50,51,52}{-html4,-html5,}{-qa,}
+    py{36,37,38,39}-sphinx{18,20,21,22,23,24,30,31,32,33,34,35,40,41,42,43,44,45,50,51,52}{-html4,-html5,}{-qa,}
     # Python 3.10 working from Sphinx 4.2 and up
     py{310}-sphinx{42,43,44,45,50,51,52,53,latest}{-html4,-html5}{-qa,}
     # Sphinx 6+ has simplified docutils and Python support