diff --git a/docs/libs/rhandsontable-0.3.7/rhandsontable.css b/docs/libs/rhandsontable-0.3.7/rhandsontable.css
index b6ac0d9..cc3bb38 100644
--- a/docs/libs/rhandsontable-0.3.7/rhandsontable.css
+++ b/docs/libs/rhandsontable-0.3.7/rhandsontable.css
@@ -18,7 +18,7 @@
 
 /* fix for shiny datepicker */
 .datepicker {
-  z-index: 1000 !important;
+  z-index: 9999 !important;
 }
 
 .handsontable table thead th {
diff --git a/inst/htmlwidgets/rhandsontable.css b/inst/htmlwidgets/rhandsontable.css
index b6ac0d9..cc3bb38 100644
--- a/inst/htmlwidgets/rhandsontable.css
+++ b/inst/htmlwidgets/rhandsontable.css
@@ -18,7 +18,7 @@
 
 /* fix for shiny datepicker */
 .datepicker {
-  z-index: 1000 !important;
+  z-index: 9999 !important;
 }
 
 .handsontable table thead th {