diff --git a/package.json b/package.json
index cc5d2bb..ef20b78 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "body-parser": "^1.17.1",
     "express": "^4.15.2",
     "firebase": "^3.7.0",
-    "lodash": "^4.17.4",
+    "lodash": "^4.17.21",
     "ts-helpers": "^1.1.1",
     "@ngrx/effects": "4.1.0",
     "@ngrx/router-store": "4.1.0",
diff --git a/yarn.lock b/yarn.lock
index 54e5b8a..f9bec6a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3720,9 +3720,9 @@ lodash@^3.8.0:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
 
-lodash@^4.0.0, lodash@^4.11.1, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.3.0, lodash@^4.5.0, lodash@~4.17.4:
-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
+lodash@^4.0.0, lodash@^4.11.1, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.17.21, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.3.0, lodash@^4.5.0, lodash@~4.17.4:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
 log4js@^0.6.31:
   version "0.6.38"