diff --git a/pyproject.toml b/pyproject.toml
index 9bb7b5d..16941e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,4 +15,5 @@ dynamic = ["version"]
 dependencies = [
     "Pillow",
     "numpy",
+    "pyphen",
 ]