diff --git a/setup.py b/setup.py
index 168b291..c28ada9 100755
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
     'pytz',
     'dateparser>=0.7.0',
     'tzlocal',
-    'pendulum>=1.0',
+    'pendulum>=1.0, <=1.5.1',
     'snaptime'
 ]