diff --git a/pyproject.toml b/pyproject.toml
index 243cc84..5440552 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ dev = [
     "pytest>=8.0.0",
     "pytest-cov>=5.0.0",
     "ruff>=0.5.0",
+    "numpy>=1.24.0",
 ]
 enrich = [
     # AI post-processing of interview answers -- requires ANTHROPIC_API_KEY