diff --git a/smm4h/requirements.txt b/smm4h/requirements.txt
index 45171f1..6401dae 100644
--- a/smm4h/requirements.txt
+++ b/smm4h/requirements.txt
@@ -55,7 +55,7 @@ liac-arff==2.1.1
 Markdown==3.2.1
 MarkupSafe==1.1.1
 matplotlib==3.2.1
-mistune==0.8.3
+mistune==2.0.3
 msgpack==0.6.1
 msgpack-numpy==0.4.1
 msgpack-python==0.5.6