diff --git a/pyproject.toml b/pyproject.toml
index 36c0b09..f870efb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,8 @@ dependencies = [
   "tifffile>=2021.7.2",
   "numpy>=1.21.0",
   "sainsc",  # Version not specified; verify if necessary
-  "sympy>=1.8"
+  "sympy>=1.8",
+  "points2regions"
 ]