diff --git a/setup.py b/setup.py
index 916fe27c..b9376260 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
     'harvestingkit>=0.6.12',
     'Sickle~=0.6,>=0.6.2',
     # newer versions seem incompatible with required scrapyd version
-    'Twisted==20.3.0',
+    'Twisted~=18.0,>=18.9.0',
     #latex parsing
     'pylatexenc~=2.9',
     'queuelib>=1.5.0',