diff --git a/src/core/SPE.Emitter.js b/src/core/SPE.Emitter.js
index c9eba34..a9b8585 100644
--- a/src/core/SPE.Emitter.js
+++ b/src/core/SPE.Emitter.js
@@ -176,7 +176,7 @@ SPE.Emitter = function( options ) {
         console.warn( 'onParticleSpawn has been removed. Please set properties directly to alter values at runtime.' );
     }
 
-    this.uuid = THREE.Math.generateUUID();
+    this.uuid = THREE.MathUtils.generateUUID();
 
     this.type = utils.ensureTypedArg( options.type, types.NUMBER, SPE.distributions.BOX );
 
diff --git a/src/core/SPE.Group.js b/src/core/SPE.Group.js
index 1e1d585..440f586 100644
--- a/src/core/SPE.Group.js
+++ b/src/core/SPE.Group.js
@@ -68,7 +68,7 @@ SPE.Group = function( options ) {
     options.texture = utils.ensureTypedArg( options.texture, types.OBJECT, {} );
 
     // Assign a UUID to this instance
-    this.uuid = THREE.Math.generateUUID();
+    this.uuid = THREE.MathUtils.generateUUID();
 
     // If no `deltaTime` value is passed to the `SPE.Group.tick` function,
     // the value of this property will be used to advance the simulation.