diff --git a/README.md b/README.md
index 75ededaa..de73d823 100644
--- a/README.md
+++ b/README.md
@@ -629,7 +629,7 @@ The <ClipPath> SVG element defines a clipping path. A clipping path is used/refe
     width="100"
 >
     <Defs>
-        <RadialGradient id="grad" cx="50%" cy="50%" rx="50%" ry="50%" fx="50%" fy="50%">
+        <RadialGradient id="grad" cx="50%" cy="50%" rx="50%" ry="50%" fx="50%" fy="50%" gradientUnits="userSpaceOnUse">
             <Stop
                 offset="0%"
                 stopColor="#ff0"
@@ -726,7 +726,7 @@ The <RadialGradient> element is used to define a radial gradient. The <RadialGra
     width="300"
 >
     <Defs>
-        <RadialGradient id="grad" cx="150" cy="75" rx="85" ry="55" fx="150" fy="75">
+        <RadialGradient id="grad" cx="150" cy="75" rx="85" ry="55" fx="150" fy="75" gradientUnits="userSpaceOnUse">
             <Stop
                 offset="0"
                 stopColor="#ff0"
diff --git a/elements/LinearGradient.js b/elements/LinearGradient.js
index 24fca363..c6174cb2 100644
--- a/elements/LinearGradient.js
+++ b/elements/LinearGradient.js
@@ -11,6 +11,7 @@ export default class extends Component{
         x2: numberProp.isRequired,
         y1: numberProp.isRequired,
         y2: numberProp.isRequired,
+        gradientUnits: PropTypes.oneOf(['objectBoundingBox', 'userSpaceOnUse']),
         id: PropTypes.string.isRequired
     };
 
diff --git a/elements/RadialGradient.js b/elements/RadialGradient.js
index 29b10a97..5fabdeba 100644
--- a/elements/RadialGradient.js
+++ b/elements/RadialGradient.js
@@ -14,6 +14,7 @@ export default class extends Component{
         cx: numberProp.isRequired,
         cy: numberProp.isRequired,
         r: numberProp,
+        gradientUnits: PropTypes.oneOf(['objectBoundingBox', 'userSpaceOnUse']),
         id: PropTypes.string.isRequired
     };
 
diff --git a/package.json b/package.json
index 916e8e96..644895fa 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-    "version": "5.1.7",
+    "version": "5.1.8",
     "name": "react-native-svg",
     "description": "SVG library for react-native",
     "repository": {
@@ -22,8 +22,8 @@
         "lint": "eslint ./"
     },
     "peerDependencies": {
-        "react-native": ">=0.40.0",
-        "react": ">=15.4.0"
+        "react-native": ">=0.44.0",
+        "react": "16.0.0-alpha.6"
     },
     "dependencies": {
         "color": "^0.11.1",