diff --git a/package.json b/package.json
index 108538650..59e320a24 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "devDependencies": {
         "@0x/tslint-config": "^3.0.1",
         "@types/body-parser": "^1.17.1",
-        "@types/express": "^4.17.1",
+        "@types/express": "^4.17.9",
         "@types/lodash": "^4.14.137",
         "@types/websocket": "^0.0.40",
         "cross-env": "^5.1.4",
diff --git a/yarn.lock b/yarn.lock
index 99b8286b9..65223aa0d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -630,12 +630,13 @@
     "@types/node" "*"
     "@types/range-parser" "*"
 
-"@types/express@^4.17.1":
-  version "4.17.1"
-  resolved "https://registry.yarnpkg.com/@types/express/-/express-4.17.1.tgz#4cf7849ae3b47125a567dfee18bfca4254b88c5c"
+"@types/express@^4.17.9":
+  version "4.17.9"
+  resolved "https://registry.yarnpkg.com/@types/express/-/express-4.17.9.tgz#f5f2df6add703ff28428add52bdec8a1091b0a78"
   dependencies:
     "@types/body-parser" "*"
     "@types/express-serve-static-core" "*"
+    "@types/qs" "*"
     "@types/serve-static" "*"
 
 "@types/hdkey@^0.7.0":
@@ -680,6 +681,10 @@
   version "15.7.3"
   resolved "https://registry.yarnpkg.com/@types/prop-types/-/prop-types-15.7.3.tgz#2ab0d5da2e5815f94b0b9d4b95d1e5f243ab2ca7"
 
+"@types/qs@*":
+  version "6.9.5"
+  resolved "https://registry.yarnpkg.com/@types/qs/-/qs-6.9.5.tgz#434711bdd49eb5ee69d90c1d67c354a9a8ecb18b"
+
 "@types/range-parser@*":
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.3.tgz#7ee330ba7caafb98090bece86a5ee44115904c2c"