diff --git a/vignettes/using-the-lifeinsurancecontracts-package.Rmd b/vignettes/using-the-lifeinsurancecontracts-package.Rmd
index 78b77aab6c866575a8f6585e341690b7c7699e38..29190d342d7365aab8e0f7361e0617a533a9597f 100644
--- a/vignettes/using-the-lifeinsurancecontracts-package.Rmd
+++ b/vignettes/using-the-lifeinsurancecontracts-package.Rmd
@@ -27,6 +27,7 @@ library(kableExtra)
 library(LifeInsuranceContracts)
 library(dplyr)
 library(tibble)
+library(lubridate)
 options(scipen=5)
 
 library(pander)