invalidateSelf after setAlpha
diff --git a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
index 4769035..ace4319 100644
--- a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
+++ b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
@@ -276,6 +276,7 @@
   @Override
   public void setAlpha(@IntRange(from = 0, to = 255) int alpha) {
     this.alpha = alpha;
+    invalidateSelf();
   }
 
   @Override