diff --git a/pyproject.toml b/pyproject.toml
index a8eabd4..b4b5478 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ classifiers = [
 ]
 dependencies = [
     "anthropic==0.7.7",
+    "attrs==23.1.0",
     "black==23.1.0",
     "google-generativeai==0.1.0",
     "openai==1.3.8",