diff --git a/R-package/vignettes/xgboost.bib b/R-package/vignettes/xgboost.bib
index 5deb1e13d..908be3136 100644
--- a/R-package/vignettes/xgboost.bib
+++ b/R-package/vignettes/xgboost.bib
@@ -18,13 +18,11 @@
   publisher={Institute of Mathematical Statistics}
 }
 
-
 @misc{
     Bache+Lichman:2013 ,
     author = "K. Bache and M. Lichman",
     year = "2013",
     title = "{UCI} Machine Learning Repository",
-    url = "http://archive.ics.uci.edu/ml/",
-    institution = "University of California, Irvine, School of Information and Computer Sciences" 
+    url = "https://archive.ics.uci.edu/",
+    institution = "University of California, Irvine, School of Information and Computer Sciences"
 }
-