diff --git a/ckg/notebooks/recipes/Combining_CKG_with_Clustergrammer/requirements.txt b/ckg/notebooks/recipes/Combining_CKG_with_Clustergrammer/requirements.txt
index bfde82aa..bb346f98 100644
--- a/ckg/notebooks/recipes/Combining_CKG_with_Clustergrammer/requirements.txt
+++ b/ckg/notebooks/recipes/Combining_CKG_with_Clustergrammer/requirements.txt
@@ -17,7 +17,7 @@ jupyter-core==4.6.3
 jupyterlab==2.2.6
 kiwisolver==1.2.0
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.2.0
 mkl-random==1.1.1
 mkl-service==2.3.0