diff --git a/modules/bitmex-realtime-api/yarn.lock b/modules/bitmex-realtime-api/yarn.lock
index cf267b4..a2e9e7c 100644
--- a/modules/bitmex-realtime-api/yarn.lock
+++ b/modules/bitmex-realtime-api/yarn.lock
@@ -67,8 +67,8 @@ isarray@~1.0.0:
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
 
 lodash@^4.17.10:
-  version "4.17.10"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 methods@^1.1.1:
   version "1.1.2"