diff --git a/R-package/DESCRIPTION b/R-package/DESCRIPTION
index 0182aa197..adf7559ef 100644
--- a/R-package/DESCRIPTION
+++ b/R-package/DESCRIPTION
@@ -24,7 +24,7 @@ Imports:
     methods,
     data.table (>= 1.9.4),
     magrittr (>= 1.5),
-    stringr,
+    stringr (>= 0.6.2),
     DiagrammeR (>= 0.4),
     ggplot2 (>= 1.0.0),
     Ckmeans.1d.dp (>= 3.02)