diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
index 911d480c7..1b2406c17 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
@@ -179,7 +179,7 @@ public class Animation {
 		event, drawOrder, //
 		ikConstraint, transformConstraint, //
 		pathConstraintPosition, pathConstraintSpacing, pathConstraintMix, //
-		physicsConstraintInertia, physicsConstraintStrength, physicsConstraintDamping, physicsConstraintFriction, //
+		physicsConstraintInertia, physicsConstraintStrength, physicsConstraintDamping, //
 		physicsConstraintMass, physicsConstraintWind, physicsConstraintGravity, physicsConstraintMix, //
 		sequence
 	}
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
index 410c8d689..9f2c6d115 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
@@ -35,7 +35,7 @@ package com.esotericsoftware.spine;
 public class PhysicsConstraintData extends ConstraintData {
 	BoneData bone;
 	boolean x, y, rotate, scaleX, shearX;
-	float step, inertia, strength, damping, friction, mass, wind, gravity, mix;
+	float step, inertia, strength, damping, mass, wind, gravity, mix;
 
 	public PhysicsConstraintData (String name) {
 		super(name);
@@ -122,14 +122,6 @@ public class PhysicsConstraintData extends ConstraintData {
 		this.damping = damping;
 	}
 
-	public float getFriction () {
-		return friction;
-	}
-
-	public void setFriction (float friction) {
-		this.friction = friction;
-	}
-
 	/** The inverse of the mass. */
 	public float getMass () {
 		return mass;
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
index 782d63ad6..e7d9336f1 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
@@ -320,7 +320,6 @@ public class SkeletonBinary extends SkeletonLoader {
 				data.inertia = input.readFloat();
 				data.strength = input.readFloat();
 				data.damping = input.readFloat();
-				data.friction = input.readFloat();
 				data.mass = input.readFloat();
 				data.wind = input.readFloat();
 				data.gravity = input.readFloat();
diff --git a/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java b/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
index 6c023d4be..24d16fabc 100644
--- a/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
+++ b/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
@@ -268,6 +268,7 @@ public class SkeletonViewer extends ApplicationAdapter {
 			delta = Math.min(delta, 0.032f) * ui.speedSlider.getValue();
 			state.update(delta);
 			state.apply(skeleton);
+			skeleton.update(delta);
 			skeleton.updateWorldTransform(Physics.update);
 
 			batch.begin();