diff --git a/package.json b/package.json
index e2bb65d..e9afb0d 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "prebuild": "rm -rf dist/"
   },
   "dependencies": {
-    "express-promise-router": "^3.0.3",
+    "express-promise-router": "^4.0.1",
     "io-ts-reporters": "^1.2.2"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 4e52192..82d72b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -157,12 +157,12 @@ etag@~1.8.1:
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=
 
-express-promise-router@^3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/express-promise-router/-/express-promise-router-3.0.3.tgz#5e6d22a5a3f013d71833172fe8d7ab780c3f6b70"
-  integrity sha1-Xm0ipaPwE9cYMxcv6NereAw/a3A=
+express-promise-router@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/express-promise-router/-/express-promise-router-4.0.1.tgz#7ed65473a12208ec1065c1358c398175b89d425c"
+  integrity sha512-kqan6QuMV7FdfN9b2uYpaKEJnxzfj57voI4IsMjgug5mBc6/hjuvoUT76Z/pvRqID2isl/NygTUe8S2MH2trMg==
   dependencies:
-    is-promise "^2.1.0"
+    is-promise "^4.0.0"
     lodash.flattendeep "^4.0.0"
     methods "^1.0.0"
 
@@ -291,10 +291,10 @@ ipaddr.js@1.9.1:
   resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.9.1.tgz#bff38543eeb8984825079ff3a2a8e6cbd46781b3"
   integrity sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g==
 
-is-promise@^2.1.0:
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-2.2.2.tgz#39ab959ccbf9a774cf079f7b40c7a26f763135f1"
-  integrity sha512-+lP4/6lKUBfQjZ2pdxThZvLUAafmZb8OAxFb8XXtiQmS35INgr85hdOGoEs124ez1FCnZJt6jau/T+alh58QFQ==
+is-promise@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-4.0.0.tgz#42ff9f84206c1991d26debf520dd5c01042dd2f3"
+  integrity sha512-hvpoI6korhJMnej285dSg6nu1+e6uxs7zG3BYAm5byqDsgJNWwxzM6z6iZiAgQR4TJ30JmBTOwqZUw3WlyH3AQ==
 
 lodash.flattendeep@^4.0.0:
   version "4.4.0"