diff --git a/requirements.txt b/requirements.txt
index e06897ec..10405c76 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ openpyxl==3.1.1
 pytz==2022.7.1
 requests==2.28.2
 rabe-cridlib==0.6.0
+dateutils==0.6.12