diff --git a/4_clustering/clustering.Rmd b/4_clustering/clustering.Rmd
index a0aef1ec1fa3c69b3589f0988903af26ffc41a9d..be08f2d8470ae957ef0a0b9765620d4bae2bab7b 100644
--- a/4_clustering/clustering.Rmd
+++ b/4_clustering/clustering.Rmd
@@ -156,6 +156,7 @@ weighted by $P$
 ### Pearson $0.7992528$
 ```{r cor_pearson, include=F, echo=F, warning=F, message=F, cache = T}
 library(tidyverse)
+install.packages("copula")
 library(copula)
 cop <- normalCopula(param = 0.8, dim = 2) 
 x <- rMvdc(