diff --git a/README.md b/README.md
index 6860df3a..e438ae20 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.68 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.74 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 87176674..4f50a73e 100644
--- a/mithril.js
+++ b/mithril.js
@@ -174,6 +174,20 @@ PromisePolyfill.prototype.then = function(onFulfilled, onRejection) {
 PromisePolyfill.prototype.catch = function(onRejection) {
 	return this.then(null, onRejection)
 }
+PromisePolyfill.prototype.finally = function(callback) {
+	return this.then(
+		function(value) {
+			return PromisePolyfill.resolve(callback()).then(function() {
+				return value
+			})
+		},
+		function(reason) {
+			return PromisePolyfill.resolve(callback()).then(function() {
+				return PromisePolyfill.reject(reason);
+			})
+		}
+	)
+}
 PromisePolyfill.resolve = function(value) {
 	if (value instanceof PromisePolyfill) return value
 	return new PromisePolyfill(function(resolve) {resolve(value)})
@@ -208,10 +222,18 @@ PromisePolyfill.race = function(list) {
 	})
 }
 if (typeof window !== "undefined") {
-	if (typeof window.Promise === "undefined") window.Promise = PromisePolyfill
+	if (typeof window.Promise === "undefined") {
+		window.Promise = PromisePolyfill
+	} else if (!window.Promise.prototype.finally) {
+		window.Promise.prototype.finally = PromisePolyfill.prototype.finally
+	}
 	var PromisePolyfill = window.Promise
 } else if (typeof global !== "undefined") {
-	if (typeof global.Promise === "undefined") global.Promise = PromisePolyfill
+	if (typeof global.Promise === "undefined") {
+		global.Promise = PromisePolyfill
+	} else if (!global.Promise.prototype.finally) {
+		global.Promise.prototype.finally = PromisePolyfill.prototype.finally
+	}
 	var PromisePolyfill = global.Promise
 } else {
 }
diff --git a/mithril.min.js b/mithril.min.js
index 4b3ed3ed..3b95ad15 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,47 +1,47 @@
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