diff --git a/ci/travis-36-doc.yaml b/ci/travis-36-doc.yaml
index 50626088d5bc4..8353659e7b9a9 100644
--- a/ci/travis-36-doc.yaml
+++ b/ci/travis-36-doc.yaml
@@ -12,7 +12,7 @@ dependencies:
   - html5lib
   - hypothesis>=3.58.0
   - ipykernel
-  - ipython
+  - ipython==6.5.0
   - ipywidgets
   - lxml
   - matplotlib