diff --git a/a-naive/yarn.lock b/a-naive/yarn.lock
index accbc0e..a8a1fdc 100644
--- a/a-naive/yarn.lock
+++ b/a-naive/yarn.lock
@@ -1181,9 +1181,9 @@ lodash.toarray@^4.4.0:
   integrity sha1-JMS/zWsvuji/0FlNsRedjptlZWE=
 
 lodash@^4.17.4:
-  version "4.17.11"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.11.tgz#b39ea6229ef607ecd89e2c8df12536891cac9b8d"
-  integrity sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 loud-rejection@^1.0.0:
   version "1.6.0"