diff --git a/package.json b/package.json
index aa6d92a5..b7e8f447 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "test-listen": "1.1.0",
     "tslint": "5.11.0",
     "tslint-config-prettier": "1.15.0",
-    "typescript": "3.1.6",
+    "typescript": "3.4.2",
     "typescript-tslint-plugin": "0.0.5"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 9e58769c..374556a4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1888,10 +1888,10 @@ typescript-tslint-plugin@0.0.5:
     minimatch "^3.0.4"
     vscode-languageserver "^5.1.0"
 
-typescript@3.1.6:
-  version "3.1.6"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.6.tgz#b6543a83cfc8c2befb3f4c8fba6896f5b0c9be68"
-  integrity sha512-tDMYfVtvpb96msS1lDX9MEdHrW4yOuZ4Kdc4Him9oU796XldPYF/t2+uKoX0BBa0hXXwDlqYQbXY5Rzjzc5hBA==
+typescript@3.4.2:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.2.tgz#9ed4e6475d906f589200193be056f5913caed481"
+  integrity sha512-Og2Vn6Mk7JAuWA1hQdDQN/Ekm/SchX80VzLhjKN9ETYrIepBFAd8PkOdOTK2nKt0FCkmMZKBJvQ1dV1gIxPu/A==
 
 uglify-js@^3.1.4:
   version "3.4.9"