diff --git a/package.json b/package.json
index 780bd87..17dd61b 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "compression": "^1.7.4",
     "express": "^4.17.1",
     "fontsource-roboto": "^3.0.3",
+    "lodash.union": "^4.6.0",
     "next": "10.0.3",
     "react": "17.0.1",
     "react-dom": "17.0.1"
diff --git a/yarn.lock b/yarn.lock
index 098586f..aaadd8d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4205,6 +4205,11 @@ lodash.sortby@^4.7.0:
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
   integrity sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=
 
+lodash.union@^4.6.0:
+  version "4.6.0"
+  resolved "https://registry.yarnpkg.com/lodash.union/-/lodash.union-4.6.0.tgz#48bb5088409f16f1821666641c44dd1aaae3cd88"
+  integrity sha1-SLtQiECfFvGCFmZkHETdGqrjzYg=
+
 lodash.zip@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/lodash.zip/-/lodash.zip-4.2.0.tgz#ec6662e4896408ed4ab6c542a3990b72cc080020"