diff --git a/docs/requirements.txt b/docs/requirements.txt
index c307982..49985ac 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -37,7 +37,7 @@ mpmath==1.0.0
 nbconvert==5.3.1
 nbformat==4.4.0
 nbsphinx==0.3.5
-notebook==6.4.1
+notebook==6.4.12
 numpy==1.15.4
 optlang==1.4.3
 packaging==18.0