diff --git a/package.json b/package.json
index e36d6e35..4ea11a78 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "is-utf8": "0.2.1",
     "linkify-it": "2.0.3",
     "lodash": "4.17.11",
-    "mime-types": "2.1.20",
+    "mime-types": "2.1.21",
     "moment": "2.22.2",
     "package-json": "5.0.0",
     "primer-tooltips": "1.5.7",
diff --git a/yarn.lock b/yarn.lock
index e4d0de58..ac3ee0e6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4606,7 +4606,17 @@ miller-rabin@^4.0.0:
   version "1.36.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.36.0.tgz#5020478db3c7fe93aad7bbcc4dcf869c43363397"
 
-mime-types@2.1.20, mime-types@^2.1.12, mime-types@~2.1.17, mime-types@~2.1.18, mime-types@~2.1.19:
+mime-db@~1.37.0:
+  version "1.37.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.37.0.tgz#0b6a0ce6fdbe9576e25f1f2d2fde8830dc0ad0d8"
+
+mime-types@2.1.21:
+  version "2.1.21"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.21.tgz#28995aa1ecb770742fe6ae7e58f9181c744b3f96"
+  dependencies:
+    mime-db "~1.37.0"
+
+mime-types@^2.1.12, mime-types@~2.1.17, mime-types@~2.1.18, mime-types@~2.1.19:
   version "2.1.20"
   resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.20.tgz#930cb719d571e903738520f8470911548ca2cc19"
   dependencies: