diff --git a/code/14-tensorflowjs/04-rnn/es6/addition-rnn/yarn.lock b/code/14-tensorflowjs/04-rnn/es6/addition-rnn/yarn.lock
index 0ff9fc7..df94365 100644
--- a/code/14-tensorflowjs/04-rnn/es6/addition-rnn/yarn.lock
+++ b/code/14-tensorflowjs/04-rnn/es6/addition-rnn/yarn.lock
@@ -2433,8 +2433,8 @@ lodash.uniq@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
 
 lodash@^4.17.4:
-  version "4.17.5"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.5.tgz#99a92d65c0272debe8c96b6057bc8fbfa3bed511"
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 loose-envify@^1.0.0:
   version "1.3.1"