diff --git a/tox.ini b/tox.ini
index 97b7d96..9841c1d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,7 @@ deps =
     knocker: https://github.com/nephila/django-knocker/archive/master.zip?0.1.1
     knocker: djangocms-text-ckeditor<3.0
     django-meta>=1.2
+    html5lib<0.99999999
     https://github.com/nephila/djangocms-helper/archive/develop.zip
     https://github.com/aldryn/aldryn-apphooks-config/archive/master.zip
     https://github.com/nephila/djangocms-apphook-setup/archive/master.zip
@@ -41,6 +42,7 @@ skip_install = true
 deps =
     sphinx
     sphinx-rtd-theme
+    html5lib<0.99999999
     -rrequirements-test.txt
 changedir=docs
 skip_install = true