diff --git a/repo_helper.yml b/repo_helper.yml
index 9a3063c..9be47ab 100644
--- a/repo_helper.yml
+++ b/repo_helper.yml
@@ -53,4 +53,3 @@ standalone_contrib_guide: true
 sphinx_html_theme: furo
 
 extra_sphinx_extensions:
- - sphinx_click
diff --git a/tox.ini b/tox.ini
index 4a0068b..122db3a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -159,5 +159,12 @@ package = notebook2script
 addopts = --color yes --durations 25
 timeout = 300
 
+[travis]
+python =
+    3.6: py36, build, mypy
+    3.7: py37, build
+    3.8: py38, build
+    3.9: py39, build
+
 [dep_checker]
 allowed_unused = ipython