diff --git a/package-lock.json b/package-lock.json
index c84f5146a0..45f91af8fe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.8.1",
+  "version": "3.9.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/runtime/transition/index.ts b/src/runtime/transition/index.ts
index d89730fd6b..63f1e5437b 100644
--- a/src/runtime/transition/index.ts
+++ b/src/runtime/transition/index.ts
@@ -9,6 +9,24 @@ export interface TransitionConfig {
 	tick?: (t: number, u: number) => void;
 }
 
+interface BlurParams {
+	delay: number;
+	duration: number;
+}
+
+export function blur(node: Element, {
+	delay = 0,
+	duration = 400
+}: BlurParams): TransitionConfig {
+	const f = +getComputedStyle(node).filter;
+
+	return {
+		delay,
+		duration,
+		css: t => `filter: blur(${t * f})`
+	};
+}
+
 interface FadeParams {
 	delay: number;
 	duration: number;