diff --git a/requirements.txt b/requirements.txt
index 78a73f6..1fccd94 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 tornado==6.4.1
-isodate==0.7.2
+isodate==0.6.1
 pytest==8.3.2
 schwifty==2024.9.0
 Cerberus==1.3.5