diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 2aa94c6..df6e8f9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,6 +22,7 @@ jobs:
           - '3.9'
           - '3.10'
           - '3.11'
+          - '3.12'
 
     name: Python ${{ matrix.python_version }} (${{ matrix.os }})
     steps:
diff --git a/pyproject.toml b/pyproject.toml
index aa1c102..ba9fbf2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ python = "^3.8"
 skyfield = "^1.21"
 numpy = [
     { version = "<1.25", python = "3.8.*" },
-    { version = "^1.25", python = "^3.9" },
+    { version = "^1.25", python = ">=3.9,<3.13" },
 ]
 skyfield-data = ">=3,<6"
 python-dateutil = "^2.8"