diff --git a/packages/mobx/CHANGELOG.md b/packages/mobx/CHANGELOG.md
index 7e15eda37..1604eae33 100644
--- a/packages/mobx/CHANGELOG.md
+++ b/packages/mobx/CHANGELOG.md
@@ -1,5 +1,13 @@
 # mobx
 
+## 6.15.1
+
+### Patch Changes
+
+-   [`df81c144fb148b64140d761aa61f032a7f429e12`](https://github.com/mobxjs/mobx/commit/df81c144fb148b64140d761aa61f032a7f429e12) [#4523](https://github.com/mobxjs/mobx/pull/4523) Thanks [@exzos28](https://github.com/exzos28)! - Make `FlowCancellationError` a proper `Error` instance while preserving its previous string representation.
+
+-   [`21fc4de6c09a77caf115aedd2fe6df972637412b`](https://github.com/mobxjs/mobx/commit/21fc4de6c09a77caf115aedd2fe6df972637412b) [#4626](https://github.com/mobxjs/mobx/pull/4626) Thanks [@kubk](https://github.com/kubk)! - Export `CancellablePromise` from the public `mobx` entrypoint.
+
 ## 6.15.0
 
 ### Minor Changes
diff --git a/packages/mobx/package.json b/packages/mobx/package.json
index df508daca..c6eaa42d9 100644
--- a/packages/mobx/package.json
+++ b/packages/mobx/package.json
@@ -1,6 +1,6 @@
 {
     "name": "mobx",
-    "version": "6.15.0",
+    "version": "6.15.1",
     "description": "Simple, scalable state management.",
     "source": "src/mobx.ts",
     "main": "dist/index.js",
diff --git a/packages/mobx/src/api/flow.ts b/packages/mobx/src/api/flow.ts
index ced847471..43b00715c 100644
--- a/packages/mobx/src/api/flow.ts
+++ b/packages/mobx/src/api/flow.ts
@@ -17,10 +17,17 @@ export const FLOW = "flow"
 
 let generatorId = 0
 
-export function FlowCancellationError() {
-    this.message = "FLOW_CANCELLED"
+export class FlowCancellationError extends Error {
+    constructor() {
+        super("FLOW_CANCELLED")
+        Object.setPrototypeOf(this, new.target.prototype)
+        this.name = "FlowCancellationError"
+    }
+
+    toString() {
+        return `Error: ${this.message}`
+    }
 }
-FlowCancellationError.prototype = Object.create(Error.prototype)
 
 export function isFlowCancellationError(error: Error) {
     return error instanceof FlowCancellationError
diff --git a/packages/mobx/src/mobx.ts b/packages/mobx/src/mobx.ts
index cd7cb05af..cb366b52a 100644
--- a/packages/mobx/src/mobx.ts
+++ b/packages/mobx/src/mobx.ts
@@ -108,6 +108,7 @@ export {
     flow,
     isFlow,
     flowResult,
+    CancellablePromise,
     FlowCancellationError,
     isFlowCancellationError,
     toJS,