Update README.md

nicolaskruchten · web-flow · commit 9eb4db0b3373 · 2019-10-26T22:02:05.000-07:00
diff --git a/README.md b/README.md
@@ -26,7 +26,7 @@
 
 ## Quickstart
 
-`pip install plotly "notebook>=5.3" "ipywidgets>=7.2"`
+`pip install plotly==4.2.1 "notebook>=5.3" "ipywidgets>=7.2"`
 
 Inside [Jupyter notebook](https://jupyter.org/install):
 ```python
