diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96d6e859d..5e051f64c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -302,6 +302,7 @@
   * Timeline track appearance and Inspector: Tracks now show icons and track colors to make them easier to distinguish. When a Track is selected, the Inspector now shows an editable track name which was previously only editable at the Timeline asset.
   * Added example component `SkeletonRenderTexture` to render a `SkeletonRenderer` to a `RenderTexture`, mainly for proper transparency. Added an example scene named `RenderTexture FadeOut Transparency` that demonstrates usage for a fadeout transparency effect.
   * Added another fadeout example component named `SkeletonRenderTextureFadeout` which takes over transparency fadeout when enabled. You can use this component as-is, attach it in disabled state and enable it to start a fadeout effect.
+  * Timeline clips now offer an additional `Alpha` parameter for setting a custom constant mix alpha value other than 1.0, just as `TrackEntry.Alpha`. Defaults to 1.0.
 
 * **Changes of default values**
 
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateDrawer.cs b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateDrawer.cs
index 7fc823add..1e08c1bb6 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateDrawer.cs
+++ b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateDrawer.cs
@@ -36,7 +36,7 @@ using UnityEngine;
 public class SpineAnimationStateDrawer : PropertyDrawer {
 
 	public override float GetPropertyHeight (SerializedProperty property, GUIContent label) {
-		const int fieldCount = 15;
+		const int fieldCount = 16;
 		return fieldCount * EditorGUIUtility.singleLineHeight;
 	}
 
@@ -48,6 +48,7 @@ public class SpineAnimationStateDrawer : PropertyDrawer {
 		SerializedProperty useBlendDurationProp = property.FindPropertyRelative("useBlendDuration");
 		SerializedProperty mixDurationProp = property.FindPropertyRelative("mixDuration");
 		SerializedProperty holdPreviousProp = property.FindPropertyRelative("holdPrevious");
+		SerializedProperty alphaProp = property.FindPropertyRelative("alpha");
 		SerializedProperty dontPauseWithDirectorProp = property.FindPropertyRelative("dontPauseWithDirector");
 		SerializedProperty dontEndWithClip = property.FindPropertyRelative("dontEndWithClip");
 		SerializedProperty endMixOutDuration = property.FindPropertyRelative("endMixOutDuration");
@@ -129,5 +130,8 @@ public class SpineAnimationStateDrawer : PropertyDrawer {
 
 		singleFieldRect.y += lineHeightWithSpacing;
 		EditorGUI.PropertyField(singleFieldRect, drawOrderProp);
+
+		singleFieldRect.y += lineHeightWithSpacing;
+		EditorGUI.PropertyField(singleFieldRect, alphaProp);
 	}
 }
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateBehaviour.cs b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateBehaviour.cs
index 0e76688b2..72b9394cc 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateBehaviour.cs
+++ b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateBehaviour.cs
@@ -69,6 +69,9 @@ namespace Spine.Unity.Playables {
 
 		[Range(0, 1f)]
 		public float drawOrderThreshold = 0.5f;
+
+		[Range(0, 1f)]
+		public float alpha = 1.0f;
 	}
 
 }
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateMixerBehaviour.cs b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateMixerBehaviour.cs
index e489ac2d7..77dd3b983 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateMixerBehaviour.cs
+++ b/spine-unity/Modules/com.esotericsoftware.spine.timeline/Runtime/SpineAnimationState/SpineAnimationStateMixerBehaviour.cs
@@ -193,6 +193,7 @@ namespace Spine.Unity.Playables {
 						trackEntry.TimeScale = clipSpeed * rootSpeed;
 						trackEntry.AttachmentThreshold = clipData.attachmentThreshold;
 						trackEntry.HoldPrevious = clipData.holdPrevious;
+						trackEntry.Alpha = clipData.alpha;
 
 						if (clipData.customDuration)
 							trackEntry.MixDuration = customMixDuration / rootSpeed;
@@ -289,6 +290,7 @@ namespace Spine.Unity.Playables {
 						if (toAnimation != null) {
 							toEntry = dummyAnimationState.SetAnimation(0, toAnimation, clipData.loop);
 							toEntry.HoldPrevious = clipData.holdPrevious;
+							toEntry.Alpha = clipData.alpha;
 						}
 					}
 
@@ -304,7 +306,7 @@ namespace Spine.Unity.Playables {
 					dummyAnimationState.Apply(skeleton);
 				} else {
 					if (toAnimation != null)
-						toAnimation.Apply(skeleton, 0, toClipTime, clipData.loop, null, 1f, MixBlend.Setup, MixDirection.In);
+						toAnimation.Apply(skeleton, 0, toClipTime, clipData.loop, null, clipData.alpha, MixBlend.Setup, MixDirection.In);
 				}
 
 				if (skeletonAnimation) {
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.timeline/package-no-spine-unity-dependency.json b/spine-unity/Modules/com.esotericsoftware.spine.timeline/package-no-spine-unity-dependency.json
index 382e3bb06..56a626bf9 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.timeline/package-no-spine-unity-dependency.json
+++ b/spine-unity/Modules/com.esotericsoftware.spine.timeline/package-no-spine-unity-dependency.json
@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.timeline",
 	"displayName": "Spine Timeline Extensions",
 	"description": "This plugin provides integration of spine-unity for the Unity Timeline.\n\nPrerequisites:\nIt requires a working installation of the spine-unity runtime (via the spine-unity unitypackage), version 4.1.\n(See http://esotericsoftware.com/git/spine-runtimes/spine-unity)",
-	"version": "4.1.4",
+	"version": "4.1.5",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",
diff --git a/spine-unity/Modules/com.esotericsoftware.spine.timeline/package.json b/spine-unity/Modules/com.esotericsoftware.spine.timeline/package.json
index 842059712..b4332da54 100644
--- a/spine-unity/Modules/com.esotericsoftware.spine.timeline/package.json
+++ b/spine-unity/Modules/com.esotericsoftware.spine.timeline/package.json
@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.timeline",
 	"displayName": "Spine Timeline Extensions",
 	"description": "This plugin provides integration of spine-unity for the Unity Timeline.\n\nPrerequisites:\nIt requires a working installation of the spine-unity and spine-csharp runtimes as UPM packages (not as spine-unity unitypackage), version 4.1.\n(See http://esotericsoftware.com/git/spine-runtimes/spine-unity)",
-	"version": "4.1.4",
+	"version": "4.1.5",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",