diff --git a/DESCRIPTION b/DESCRIPTION
index 4a6af69..fa8126e 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -23,7 +23,8 @@ Imports:
     methods
 Depends:
     TMB,
-    R (>= 4.0.0)
+    R (>= 4.0.0),
+    Matrix
 Suggests:
     semPlot,
     TreeTools,