diff --git a/packages/hn/package.json b/packages/hn/package.json
index 98338212..fe798973 100644
--- a/packages/hn/package.json
+++ b/packages/hn/package.json
@@ -11,7 +11,7 @@
   "license": "MIT",
   "dependencies": {
     "babel-runtime": "^6.26.0",
-    "deepmerge": "^2.0.0",
+    "deepmerge": "^4.0.0",
     "fetch-ponyfill": "^6.0.0",
     "get-nested": "^4.0.0",
     "isomorphic-fetch": "^2.2.1",
diff --git a/yarn.lock b/yarn.lock
index 38c56188..2e7abc82 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3383,9 +3383,10 @@ deepmerge@4.0.0:
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.0.0.tgz#3e3110ca29205f120d7cb064960a39c3d2087c09"
   integrity sha512-YZ1rOP5+kHor4hMAH+HRQnBQHg+wvS1un1hAOuIcxcBy0hzcUf6Jg2a1w65kpoOUnurOfZbERwjI1TfZxNjcww==
 
-deepmerge@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.1.0.tgz#511a54fff405fc346f0240bb270a3e9533a31102"
+deepmerge@^4.0.0:
+  version "4.2.2"
+  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.2.2.tgz#44d2ea3679b8f4d4ffba33f03d865fc1e7bf4955"
+  integrity sha512-FJ3UgI4gIl+PHZm53knsuSFpE+nESMr7M4v9QcgB7S63Kj/6WqMiFQJpBBYz1Pt+66bZpP3Q7Lye0Oo9MPKEdg==
 
 defaults@^1.0.0, defaults@^1.0.3:
   version "1.0.3"