diff --git a/dependabot/requirements.txt b/dependabot/requirements.txt
index 9fd0a60..2dc0b02 100644
--- a/dependabot/requirements.txt
+++ b/dependabot/requirements.txt
@@ -28,7 +28,7 @@ zope.formlib==6.0
 zope.hookable==6.0
 zope.i18n==5.1
 zope.i18nmessageid==6.1.0
-zope.index==6.0
+zope.index==6.1
 zope.interface==6.1
 zope.intid==5.0
 zope.keyreference==6.0
diff --git a/ztk-versions.cfg b/ztk-versions.cfg
index 40a4b76..222049c 100644
--- a/ztk-versions.cfg
+++ b/ztk-versions.cfg
@@ -30,7 +30,7 @@ zope.formlib = 6.0
 zope.hookable = 6.0
 zope.i18n = 5.1
 zope.i18nmessageid = 6.1.0
-zope.index = 6.0
+zope.index = 6.1
 zope.interface = 6.1
 zope.intid = 5.0
 zope.keyreference = 6.0