diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2513bfc..660e700 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -26,7 +26,7 @@ jupyter-core==4.3.0
 MarkupSafe==1.0
 matplotlib==2.0.2
 mistune==0.7.4
-nbconvert==5.3.1
+nbconvert==6.3.0
 nbformat==4.4.0
 networkx==2.0
 notebook==5.1.0
diff --git a/requirements.txt b/requirements.txt
index 4fae65b..7c849d2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ MarkupSafe==1.0
 matplotlib==2.1.0
 mistune==0.7.4
 multiprocess==0.70.5
-nbconvert==5.3.1
+nbconvert==6.3.0
 nbformat==4.4.0
 networkx==2.0
 notebook==5.1.0