diff --git a/setup.py b/setup.py
index 63e6053..116b6c7 100755
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ setup(name='pyhamtools',
           "requests>=2.21.0",
           "ephem>=4.1.3",
           "beautifulsoup4>=4.7.1",
-          "lxml>=4.8.0",
+          "lxml>=4.8.0,<5.0.0",
           "redis>=2.10.6",
       ],
       **kw