diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0f68f2cfb..0d84562475 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+## [4.8.1](https://github.com/ionic-team/ionic/compare/v4.8.0...v4.8.1) (2019-08-27)
+
+
+### Bug Fixes
+
+* **animation:** enable backwards compatibility for overlay animations ([#19160](https://github.com/ionic-team/ionic/issues/19160)) ([fb70980](https://github.com/ionic-team/ionic/commit/fb70980))
+* **gesture:** account for negative step values with Web Animations ([#19196](https://github.com/ionic-team/ionic/issues/19196)) ([b3c7436](https://github.com/ionic-team/ionic/commit/b3c7436))
+* **ios:** clear opacity on toolbar background after iOS transition ([#19169](https://github.com/ionic-team/ionic/issues/19169)) ([fa958a5](https://github.com/ionic-team/ionic/commit/fa958a5))
+* **md:** set fill mode on MD transition to `both` ([#19161](https://github.com/ionic-team/ionic/issues/19161)) ([0e8ab49](https://github.com/ionic-team/ionic/commit/0e8ab49))
+
+
+
 # [4.8.0 Oxygen](https://github.com/ionic-team/ionic/compare/v4.7.4...v4.8.0) (2019-08-21)
 
 
diff --git a/angular/package.json b/angular/package.json
index 75e0fef7f2..2cc5e5c9a5 100644
--- a/angular/package.json
+++ b/angular/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ionic/angular",
-  "version": "4.8.0",
+  "version": "4.8.1",
   "description": "Angular specific wrappers for @ionic/core",
   "keywords": [
     "ionic",
@@ -49,7 +49,7 @@
     "css/"
   ],
   "dependencies": {
-    "@ionic/core": "4.8.0",
+    "@ionic/core": "4.8.1",
     "tslib": "^1.9.3"
   },
   "peerDependencies": {
diff --git a/core/package.json b/core/package.json
index 4d1cc894df..4998685c9b 100644
--- a/core/package.json
+++ b/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ionic/core",
-  "version": "4.8.0",
+  "version": "4.8.1",
   "description": "Base components for Ionic",
   "keywords": [
     "ionic",
diff --git a/core/src/components/menu/menu.tsx b/core/src/components/menu/menu.tsx
index 8c55a51581..f085484dd6 100644
--- a/core/src/components/menu/menu.tsx
+++ b/core/src/components/menu/menu.tsx
@@ -416,6 +416,14 @@ export class Menu implements ComponentInterface, MenuI {
     // Account for rounding errors in JS
     let newStepValue = (shouldComplete) ? 0.001 : -0.001;
 
+    /**
+     * TODO: stepValue can sometimes return a negative
+     * value, but you can't have a negative time value
+     * for the cubic bezier curve (at least with web animations)
+     * Not sure if the negative step value is an error or not
+     */
+    const adjustedStepValue = (stepValue <= 0) ? 0.01 : stepValue;
+
     /**
      * Animation will be reversed here, so need to
      * reverse the easing curve as well
@@ -424,7 +432,7 @@ export class Menu implements ComponentInterface, MenuI {
      * to the new easing curve, as `stepValue` is going to be given
      * in terms of a linear curve.
      */
-    newStepValue += getTimeGivenProgression(new Point(0, 0), new Point(0.4, 0), new Point(0.6, 1), new Point(1, 1), stepValue);
+    newStepValue += getTimeGivenProgression(new Point(0, 0), new Point(0.4, 0), new Point(0.6, 1), new Point(1, 1), adjustedStepValue);
 
     this.animation
       .easing('cubic-bezier(0.4, 0.0, 0.6, 1)')
diff --git a/core/src/utils/gesture/swipe-back.ts b/core/src/utils/gesture/swipe-back.ts
index 5c7a96afd6..3ac10df3a3 100644
--- a/core/src/utils/gesture/swipe-back.ts
+++ b/core/src/utils/gesture/swipe-back.ts
@@ -37,7 +37,13 @@ export const createSwipeBackGesture = (
       realDur = Math.min(dur, 540);
     }
 
-    onEndHandler(shouldComplete, stepValue, realDur);
+    /**
+     * TODO: stepValue can sometimes return a negative
+     * value, but you can't have a negative time value
+     * for the cubic bezier curve (at least with web animations)
+     * Not sure if the negative step value is an error or not
+     */
+    onEndHandler(shouldComplete, (stepValue <= 0) ? 0.01 : stepValue, realDur);
   };
 
   return createGesture({
diff --git a/docs/package.json b/docs/package.json
index 94257da652..e159b705b2 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ionic/docs",
-  "version": "4.8.0",
+  "version": "4.8.1",
   "description": "Pre-packaged API documentation for the Ionic docs.",
   "main": "core.json",
   "files": [