diff --git a/pyproject.toml b/pyproject.toml
index 12e09f7..81fbffb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dependencies = [
     "scikit-image == 0.26.0",
     "scipy == 1.17.1",
     "shapely == 2.1.2",
-    "spherical-geometry == 1.3.5",
+    "spherical-geometry == 1.4.0",
     "setuptools == 82.0.1",
     "stdatamodels == 4.1.0",
     "stsci.imagestats == 1.8.4",