diff --git a/DESCRIPTION b/DESCRIPTION
index 55290d3..c39dd0a 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -19,7 +19,7 @@ Encoding: UTF-8
 LazyData: true
 Imports: 
     stats,
-    lme4,
+    lme4 (>= 1.1-35),
     purrr,
     progressr, 
     furrr,
@@ -32,3 +32,4 @@ Suggests:
 Config/testthat/edition: 3
 Depends: 
     R (>= 2.10)
+    Matrix (>= 1.6-2)