diff --git a/package.json b/package.json
index fa57915..1e0d139 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "handlebars": "^4.0.2",
     "jquery": "~3.0.0",
     "load-metalsmith-plugins": "^0.1.1",
-    "lodash": "^4.17.5",
+    "lodash": "^4.17.21",
     "markdown-it-anchor": "^2.5.0",
     "markdown-it-footnote": "^3.0.1",
     "markdown-it-implicit-figures": "^0.3.2",
diff --git a/yarn.lock b/yarn.lock
index 31fede3..23b1b3c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3369,10 +3369,10 @@ lodash@^3.10.0, lodash@^3.2.0, lodash@^3.9.3:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
   integrity sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=
 
-lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.10:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.17.21, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.10:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 lodash@~1.0.1:
   version "1.0.2"