diff --git a/docs/requirements.txt b/docs/requirements.txt
index 553dfd0f7..22e03596e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,7 +5,7 @@ pandas
 astropy>3.1
 coloredlogs
 recommonmark
-mistune==2.0.3
+mistune==3.2.1
 docutils<1.0,>=0.16
 sphinx-mdinclude
 sphinx-rtd-theme
\ No newline at end of file