diff --git a/requirements-app.txt b/requirements-app.txt
index c49316057..91f77cdb2 100644
--- a/requirements-app.txt
+++ b/requirements-app.txt
@@ -11,7 +11,7 @@ Flask-Login==0.5.0
 blinker==1.4
 pyexcel==0.6.4
 pyexcel-io==0.5.20
-pyexcel-xls==0.5.8
+pyexcel-xls==0.5.9
 pyexcel-xlsx==0.5.8
 pyexcel-ods3==0.5.3
 pytz==2020.1