diff --git a/requirements.txt b/requirements.txt
index 705f32d448ac4e9a5df8e3bac5cfd43c38305a97..d4c788da705e406bc74bd5e0301b366bef7f5e3f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+python==3.6
 plotly==3.0rc6
 ipywidgets
 notebook