diff --git a/spine-ts/package-lock.json b/spine-ts/package-lock.json
index 23488f93a..4f931ba73 100644
--- a/spine-ts/package-lock.json
+++ b/spine-ts/package-lock.json
@@ -8255,7 +8255,7 @@
     },
     "spine-canvas": {
       "name": "@esotericsoftware/spine-canvas",
-      "version": "4.0.13",
+      "version": "4.0.14",
       "license": "LicenseRef-LICENSE",
       "dependencies": {
         "@esotericsoftware/spine-core": "^4.0.13"
@@ -8263,12 +8263,12 @@
     },
     "spine-core": {
       "name": "@esotericsoftware/spine-core",
-      "version": "4.0.13",
+      "version": "4.0.14",
       "license": "LicenseRef-LICENSE"
     },
     "spine-player": {
       "name": "@esotericsoftware/spine-player",
-      "version": "4.0.13",
+      "version": "4.0.14",
       "license": "LicenseRef-LICENSE",
       "dependencies": {
         "@esotericsoftware/spine-webgl": "^4.0.13"
@@ -8276,7 +8276,7 @@
     },
     "spine-threejs": {
       "name": "@esotericsoftware/spine-threejs",
-      "version": "4.0.13",
+      "version": "4.0.14",
       "license": "LicenseRef-LICENSE",
       "dependencies": {
         "@esotericsoftware/spine-core": "^4.0.13",
@@ -8286,7 +8286,7 @@
     },
     "spine-webgl": {
       "name": "@esotericsoftware/spine-webgl",
-      "version": "4.0.13",
+      "version": "4.0.14",
       "license": "LicenseRef-LICENSE",
       "dependencies": {
         "@esotericsoftware/spine-core": "^4.0.13"
diff --git a/spine-ts/spine-core/src/AnimationState.ts b/spine-ts/spine-core/src/AnimationState.ts
index b8fe12586..5f26b5981 100644
--- a/spine-ts/spine-core/src/AnimationState.ts
+++ b/spine-ts/spine-core/src/AnimationState.ts
@@ -1095,24 +1095,24 @@ export enum EventType {
  * {@link AnimationState#addListener()}. */
 export interface AnimationStateListener {
 	/** Invoked when this entry has been set as the current entry. */
-	start (entry: TrackEntry): void;
+	start? (entry: TrackEntry): void;
 
 	/** Invoked when another entry has replaced this entry as the current entry. This entry may continue being applied for
 	 * mixing. */
-	interrupt (entry: TrackEntry): void;
+	interrupt? (entry: TrackEntry): void;
 
 	/** Invoked when this entry is no longer the current entry and will never be applied again. */
-	end (entry: TrackEntry): void;
+	end? (entry: TrackEntry): void;
 
 	/** Invoked when this entry will be disposed. This may occur without the entry ever being set as the current entry.
 	 * References to the entry should not be kept after dispose is called, as it may be destroyed or reused. */
-	dispose (entry: TrackEntry): void;
+	dispose? (entry: TrackEntry): void;
 
 	/** Invoked every time this entry's animation completes a loop. */
-	complete (entry: TrackEntry): void;
+	complete? (entry: TrackEntry): void;
 
 	/** Invoked when this entry's animation triggers an event. */
-	event (entry: TrackEntry, event: Event): void;
+	event? (entry: TrackEntry, event: Event): void;
 }
 
 export abstract class AnimationStateAdapter implements AnimationStateListener {