diff --git a/pyproject.toml b/pyproject.toml
index 487d618..0ddefd7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
 ]
 dependencies = [
-    "policyengine-us",
+    "policyengine-us>=1.168.0",
     "pandas",
     "PyYAML",
     "click",