diff --git a/setup.cfg b/setup.cfg
index f1a08fd..81268a1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -27,7 +27,7 @@ install_requires =
     scipy
     duecredit
     loguru
-    physutils
+    physutils >=0.2.1
 tests_require =
     pytest >=5.3
 test_suite = pytest