diff --git a/requirements/dev.txt b/requirements/dev.txt
index 87f8e07..c8d3005 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,6 +1,7 @@
 -r main.txt
 blessed==1.19.1
 m2r==0.2.1
+mistune<2.0.0
 parameterized==0.8.1
 pylint==2.14.5
 pytest==7.1.2