diff --git a/pyproject.toml b/pyproject.toml
index d4da8d0..fea5dab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,8 +19,12 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8,<3.12"
+python = "^3.8"
 skyfield = "^1.21"
+numpy = [
+    { version = "<1.25", python = "3.8.*" },
+    { version = "^1.25", python = "^3.9" },
+]
 skyfield-data = ">=3,<6"
 python-dateutil = "^2.8"