diff --git a/package.json b/package.json
index 2ed0dab2..7228ac51 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "irc-framework": "2.11.0",
     "lodash": "4.17.5",
     "mime-types": "2.1.18",
-    "moment": "2.20.1",
+    "moment": "2.21.0",
     "package-json": "4.0.1",
     "primer-tooltips": "1.5.2",
     "read": "1.0.7",
diff --git a/yarn.lock b/yarn.lock
index 325a7c6d..878034c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4396,9 +4396,9 @@ mocha@5.0.1:
     mkdirp "0.5.1"
     supports-color "4.4.0"
 
-moment@2.20.1:
-  version "2.20.1"
-  resolved "https://registry.yarnpkg.com/moment/-/moment-2.20.1.tgz#d6eb1a46cbcc14a2b2f9434112c1ff8907f313fd"
+moment@2.21.0:
+  version "2.21.0"
+  resolved "https://registry.yarnpkg.com/moment/-/moment-2.21.0.tgz#2a114b51d2a6ec9e6d83cf803f838a878d8a023a"
 
 mousetrap@1.6.1:
   version "1.6.1"