diff --git a/requires/installation.txt b/requires/installation.txt
index 795de93..c5fd816 100644
--- a/requires/installation.txt
+++ b/requires/installation.txt
@@ -1,2 +1,2 @@
-ietfparse>=1.4,<2
+ietfparse>=1.4,<1.5
 tornado>=3.2,<5