diff --git a/setup.py b/setup.py
index 863e67fa0..79916b775 100644
--- a/setup.py
+++ b/setup.py
@@ -59,7 +59,7 @@
         "isodate ==0.6.*",
         "jsonschema >=3.0.0, ==3.*",
         "networkx >= 2.5, <4",
-        "numpy ==1.*",
+        "numpy >=1, <3",
         "packaging >=19.2",
         "pandas >=1.0.0, <3",
         "phylo-treetime >=0.11.2, <0.12",