diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/BoneFollower.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/BoneFollower.cs
index aa33634c8..75b64cbe2 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/BoneFollower.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/BoneFollower.cs
@@ -28,12 +28,21 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using System;
 using UnityEngine;
 
 namespace Spine.Unity {
+
 	/// <summary>Sets a GameObject's transform to match a bone on a Spine skeleton.</summary>
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[AddComponentMenu("Spine/BoneFollower")]
 	public class BoneFollower : MonoBehaviour {
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/PointFollower.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/PointFollower.cs
index e75309356..91570a00c 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/PointFollower.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/PointFollower.cs
@@ -27,14 +27,20 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
- 
-using System.Collections;
-using System.Collections.Generic;
+
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 
 namespace Spine.Unity {
 
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[AddComponentMenu("Spine/Point Follower")]
 	public class PointFollower : MonoBehaviour, IHasSkeletonRenderer, IHasSkeletonComponent {
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs
index 7988b2680..9d41ffae4 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs
@@ -28,11 +28,19 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 
 namespace Spine.Unity {
 	
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[AddComponentMenu("Spine/SkeletonAnimation")]
 	public class SkeletonAnimation : SkeletonRenderer, ISkeletonAnimation, IAnimationStateComponent {
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
index f26bcd62b..83817e787 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
@@ -28,6 +28,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
 #define SPINE_OPTIONAL_RENDEROVERRIDE
 #define SPINE_OPTIONAL_MATERIALOVERRIDE
 
@@ -36,7 +39,12 @@ using UnityEngine;
 
 namespace Spine.Unity {
 	/// <summary>Base class of animated Spine skeleton components. This component manages and renders a skeleton.</summary>
-	[ExecuteInEditMode, RequireComponent(typeof(MeshFilter), typeof(MeshRenderer)), DisallowMultipleComponent]
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
+	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(MeshFilter), typeof(MeshRenderer)), DisallowMultipleComponent]
 	[HelpURL("http://esotericsoftware.com/spine-unity-rendering")]
 	public class SkeletonRenderer : MonoBehaviour, ISkeletonComponent, IHasSkeletonDataAsset {
 		[SerializeField] public SkeletonDataAsset skeletonDataAsset;
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs
index bc52a2c2e..7afdc43c3 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs
@@ -27,13 +27,20 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
 
 using UnityEngine;
 using System.Collections.Generic;
 
 namespace Spine.Unity {
 
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	public class BoundingBoxFollower : MonoBehaviour {
 		internal static bool DebugMessages = true;
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/CustomMaterials/SkeletonRendererCustomMaterials.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/CustomMaterials/SkeletonRendererCustomMaterials.cs
index ba8ce0f89..27c59ca1b 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/CustomMaterials/SkeletonRendererCustomMaterials.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/CustomMaterials/SkeletonRendererCustomMaterials.cs
@@ -28,6 +28,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
 #define SPINE_OPTIONAL_MATERIALOVERRIDE
 
 // Contributed by: Lost Polygon
@@ -37,7 +40,11 @@ using System.Collections.Generic;
 using UnityEngine;
 
 namespace Spine.Unity.Modules {
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	public class SkeletonRendererCustomMaterials : MonoBehaviour {
 
 		#region Inspector
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/BoneFollowerGraphic.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/BoneFollowerGraphic.cs
index e833c4453..15d529c56 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/BoneFollowerGraphic.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/BoneFollowerGraphic.cs
@@ -1,9 +1,17 @@
-using System.Collections;
-using System.Collections.Generic;
+
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 
 namespace Spine.Unity {
+	
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[DisallowMultipleComponent]
 	[AddComponentMenu("Spine/UI/BoneFollowerGraphic")]
 	public class BoneFollowerGraphic : MonoBehaviour {
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/SkeletonGraphic.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/SkeletonGraphic.cs
index 6b3a43eb4..620d2d940 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/SkeletonGraphic.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonGraphic/SkeletonGraphic.cs
@@ -28,12 +28,20 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 using UnityEngine.UI;
-using Spine;
 
 namespace Spine.Unity {
-	[ExecuteInEditMode, RequireComponent(typeof(CanvasRenderer), typeof(RectTransform)), DisallowMultipleComponent]
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
+	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(CanvasRenderer), typeof(RectTransform)), DisallowMultipleComponent]
 	[AddComponentMenu("Spine/SkeletonGraphic (Unity UI Canvas)")]
 	public class SkeletonGraphic : MaskableGraphic, ISkeletonComponent, IAnimationStateComponent, ISkeletonAnimation, IHasSkeletonDataAsset {
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonRenderSeparator/SkeletonRenderSeparator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
index a0dccf165..1c700c0ba 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
@@ -28,15 +28,21 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
 #define SPINE_OPTIONAL_RENDEROVERRIDE
 
 using UnityEngine;
 using System.Collections.Generic;
-using Spine.Unity;
 
 namespace Spine.Unity.Modules {
-	
+
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[HelpURL("http://esotericsoftware.com/spine-unity-skeletonrenderseparator")]
 	public class SkeletonRenderSeparator : MonoBehaviour {
 		public const int DefaultSortingOrderIncrement = 5;
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityGroundConstraint.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityGroundConstraint.cs
index d88c9af78..738ad74ad 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityGroundConstraint.cs	
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SkeletonUtility Modules/SkeletonUtilityGroundConstraint.cs	
@@ -28,10 +28,20 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 
 namespace Spine.Unity.Modules {
-	[RequireComponent(typeof(SkeletonUtilityBone)), ExecuteInEditMode]
+
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
+	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(SkeletonUtilityBone))]
 	public class SkeletonUtilityGroundConstraint : SkeletonUtilityConstraint {
 
 		[Tooltip("LayerMask for what objects to raycast against")]
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtility.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtility.cs
index 28fc69a5b..8913374ab 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtility.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtility.cs
@@ -28,15 +28,21 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
-// Contributed by: Mitch Thompson
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
 
 using UnityEngine;
 using System.Collections.Generic;
-using Spine;
 
 namespace Spine.Unity {
-	[RequireComponent(typeof(ISkeletonAnimation))]
+
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(ISkeletonAnimation))]
 	public sealed class SkeletonUtility : MonoBehaviour {
 
 		#region BoundingBoxAttachment
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityBone.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityBone.cs
index 14f24c715..4837ba9ed 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityBone.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityBone.cs
@@ -28,12 +28,19 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
-using Spine;
 
 namespace Spine.Unity {
 	/// <summary>Sets a GameObject's transform to match a bone on a Spine skeleton.</summary>
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
 	[ExecuteInEditMode]
+	#endif
 	[AddComponentMenu("Spine/SkeletonGameObjectsBone")]
 	public class SkeletonUtilityBone : MonoBehaviour {
 		public enum Mode {
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityConstraint.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityConstraint.cs
index 49fcfc265..f9177114c 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityConstraint.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonUtility/SkeletonUtilityConstraint.cs
@@ -28,10 +28,20 @@
  * POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
+#define NEW_PREFAB_SYSTEM
+#endif
+
 using UnityEngine;
 
 namespace Spine.Unity {
-	[RequireComponent(typeof(SkeletonUtilityBone)), ExecuteInEditMode]
+
+	#if NEW_PREFAB_SYSTEM
+	[ExecuteAlways]
+	#else
+	[ExecuteInEditMode]
+	#endif
+	[RequireComponent(typeof(SkeletonUtilityBone))]
 	public abstract class SkeletonUtilityConstraint : MonoBehaviour {
 
 		protected SkeletonUtilityBone bone;