diff --git a/sources/functions/fpm b/sources/functions/fpm
index a87d92df9..33cbf73ac 100644
--- a/sources/functions/fpm
+++ b/sources/functions/fpm
@@ -9,6 +9,10 @@ function install_fpm() {
         case $(_os_codename) in
             buster)
                 gem install public_suffix -v 4.0.7 >> $log 2>&1
+                gem install dotenv -v 2.8.1 >> $log 2>&1
+                ;;
+            focal)
+                gem install dotenv -v 2.8.1 >> $log 2>&1
                 ;;
             *) ;;
         esac