diff --git a/requirements_mtj.txt b/requirements_mtj.txt
index 67ff0e25..13c797f1 100644
--- a/requirements_mtj.txt
+++ b/requirements_mtj.txt
@@ -17,6 +17,7 @@ eventlet
 lupa==1.10
 markdown
 bleach==4.1.0
+chex==0.1.4
 flask-session
 marshmallow>=3.13
-apispec-webframeworks
+apispec-webframeworks
\ No newline at end of file