diff --git a/pyproject.toml b/pyproject.toml
index bf2fa21..12fca19 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ dependencies = [
     "pyTMD==2.1.6",
     "scikit-learn>=1.2.0",
     "scipy>=1.0.0",
+    "shapely>=2.0.0",
     "tqdm>=4.55.0",
     "xarray>=2022.3.0",
 ]
diff --git a/uv.lock b/uv.lock
index 3363dba..d84cdb3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -659,6 +659,7 @@ dependencies = [
     { name = "pytmd" },
     { name = "scikit-learn" },
     { name = "scipy" },
+    { name = "shapely" },
     { name = "tqdm" },
     { name = "xarray" },
 ]
@@ -705,6 +706,7 @@ requires-dist = [
     { name = "pytmd", specifier = "==2.1.6" },
     { name = "scikit-learn", specifier = ">=1.2.0" },
     { name = "scipy", specifier = ">=1.0.0" },
+    { name = "shapely", specifier = ">=2.0.0" },
     { name = "tqdm", specifier = ">=4.55.0" },
     { name = "xarray", specifier = ">=2022.3.0" },
 ]