diff --git a/package_versions.txt b/package_versions.txt
index a31294d..270c337 100755
--- a/package_versions.txt
+++ b/package_versions.txt
@@ -181,4 +181,5 @@ ubuntu-keyring2018.09.18.1~18.04.0
 util-linux2.31.1-0.4ubuntu3.6
 xauth1:1.0.10-1
 xz-utils5.2.2-1.3
+yarn1.22.4-1
 zlib1g1:1.2.11.dfsg-0ubuntu2