diff --git a/setup.py b/setup.py
index c1839345..aae3959d 100644
--- a/setup.py
+++ b/setup.py
@@ -156,7 +156,7 @@ def write_version_py(version, filename='pytrip/__init__.py'):
     "numpy>=1.18 ; python_version == '3.8'",
     "numpy>=1.15 ; python_version == '3.7'",
     "numpy>=1.12,<1.20 ; python_version == '3.6'",
-    "numpy>=1.11,<1.19 ; python_version == '3.5'",
+    "numpy>=1.11,<1.24 ; python_version == '3.5'",
     "numpy>=1.11,<1.15 ; python_version < '3.5'"  # python 3.4 and 2.7
 ]