diff --git a/package.json b/package.json
index 956fd9d82..cd9fe5fef 100644
--- a/package.json
+++ b/package.json
@@ -125,6 +125,6 @@
     "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.0",
     "angular-resizable-element": "~0.5.0",
     "calendar-utils": "0.0.38",
-    "date-fns": "^1.11.1"
+    "date-fns": "^1.15.1"
   }
 }
diff --git a/test/entry.ts b/test/entry.ts
index c5263cc3e..0fe3b6aad 100644
--- a/test/entry.ts
+++ b/test/entry.ts
@@ -2,7 +2,6 @@
 /// <reference types="chai" />
 /// <reference types="sinon" />
 /// <reference types="sinon-chai" />
-/// <reference path="../node_modules/date-fns/typings.d.ts" />
 
 import 'core-js';
 import 'zone.js/dist/zone';
diff --git a/webpack.config.umd.ts b/webpack.config.umd.ts
index 28df34655..2d4f6a971 100644
--- a/webpack.config.umd.ts
+++ b/webpack.config.umd.ts
@@ -87,7 +87,7 @@ module.exports = {
       loader: 'source-map-loader'
     }, {
       test: /\.ts$/,
-      loader: 'awesome-typescript-loader?module=es2015&ignoreDiagnostics=[2307]',
+      loader: 'awesome-typescript-loader?module=es2015',
       exclude: /node_modules/
     }, {
       test: /\.scss/,
diff --git a/yarn.lock b/yarn.lock
index ba6c56e1f..b4227e10b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1432,9 +1432,9 @@ dashdash@^1.12.0:
   dependencies:
     assert-plus "^1.0.0"
 
-date-fns@^1.11.1:
-  version "1.11.2"
-  resolved "https://registry.yarnpkg.com/date-fns/-/date-fns-1.11.2.tgz#30a8136c52633688852aa66d6d043b84ffc749de"
+date-fns@^1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/date-fns/-/date-fns-1.15.1.tgz#26b1f3163de8c9a71447adeb23c9bc40171b3fd4"
 
 date-now@^0.1.4:
   version "0.1.4"