diff --git a/package.json b/package.json
index 8f20b8f..0e532b3 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,6 @@
   "devDependencies": {
     "@istanbuljs/nyc-config-typescript": "0.1.3",
     "@types/chai": "4.1.7",
-    "@types/delay": "3.1.0",
     "@types/mocha": "5.2.7",
     "coveralls": "3.0.5",
     "delay": "4.3.0",
diff --git a/yarn.lock b/yarn.lock
index d6deed7..fc1bac0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -100,13 +100,6 @@
   resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.1.7.tgz#1b8e33b61a8c09cbe1f85133071baa0dbf9fa71a"
   integrity sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==
 
-"@types/delay@3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@types/delay/-/delay-3.1.0.tgz#c7ff788bf0d9b85f923b12182e6fbfaa65edcbdb"
-  integrity sha512-Mt16D+JxuzA2iu5VTnGS1ziGoaSAD2SZJF4Os3rxUnMk7sBSOkdH43yxoZVxSEud6t1V1JScFBaZA8r6ByjYMw==
-  dependencies:
-    delay "*"
-
 "@types/mocha@5.2.7":
   version "5.2.7"
   resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.7.tgz#315d570ccb56c53452ff8638738df60726d5b6ea"
@@ -843,16 +836,16 @@ define-properties@^1.1.2:
   dependencies:
     object-keys "^1.0.12"
 
-delay@*, delay@4.3.0:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/delay/-/delay-4.3.0.tgz#efeebfb8f545579cb396b3a722443ec96d14c50e"
-  integrity sha512-Lwaf3zVFDMBop1yDuFZ19F9WyGcZcGacsbdlZtWjQmM50tOcMntm1njF/Nb/Vjij3KaSvCF+sEYGKrrjObu2NA==
-
 delay@4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/delay/-/delay-4.0.0.tgz#a890c37829b5cd39ffe1be7453849f5a8169d5de"
   integrity sha512-M5om7qDqgWbLauRFlGgcfVEmQpHJMs24NL0I/dqahsESNdJrRiLuAodrsC1vV1YL5+yC2kh6k8vANWNKvYMd6A==
 
+delay@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/delay/-/delay-4.3.0.tgz#efeebfb8f545579cb396b3a722443ec96d14c50e"
+  integrity sha512-Lwaf3zVFDMBop1yDuFZ19F9WyGcZcGacsbdlZtWjQmM50tOcMntm1njF/Nb/Vjij3KaSvCF+sEYGKrrjObu2NA==
+
 delayed-stream@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"