diff --git a/pyproject.toml b/pyproject.toml
index d766c7d..d79635d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,6 +13,7 @@ authors = [
 ]
 dependencies = [
     "numpy",
+    "matplotlib",
     "opencv-python",
     "opencv-contrib-python"
 ]