diff --git a/pyproject.toml b/pyproject.toml
index 7e2a1f34..166fd13b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ dependencies = [
   "tqdm",
   "funlib.math",
   "funlib.geometry",
+  "dill",
 ]
 
 [project.optional-dependencies]