diff --git a/basic-microservice/yarn.lock b/basic-microservice/yarn.lock
index 83a246f..aca414f 100644
--- a/basic-microservice/yarn.lock
+++ b/basic-microservice/yarn.lock
@@ -101,10 +101,10 @@ asn1@~0.2.0:
   resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.3.tgz#dac8787713c9966849fc8180777ebe9c1ddf3b86"
 
 async@^2.0.0, async@^2.0.0-rc.5, async@^2.0.0-rc.6:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.4.1.tgz#62a56b279c98a11d0987096a01cc3eeb8eb7bbd7"
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
   dependencies:
-    lodash "^4.14.0"
+    lodash "^4.17.14"
 
 asynckit@^0.4.0:
   version "0.4.0"
@@ -1197,9 +1197,9 @@ lodash.toarray@^4.2.4:
   version "4.4.0"
   resolved "https://registry.yarnpkg.com/lodash.toarray/-/lodash.toarray-4.4.0.tgz#24c4bfcd6b2fba38bfd0594db1179d8e9b656561"
 
-lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.3.0:
-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
+lodash@^4.0.0, lodash@^4.17.14, lodash@^4.17.2, lodash@^4.3.0:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 lru-cache@2:
   version "2.7.3"