diff --git a/packages/util-crypto/package.json b/packages/util-crypto/package.json
index f847023c0..c541eb124 100644
--- a/packages/util-crypto/package.json
+++ b/packages/util-crypto/package.json
@@ -28,7 +28,7 @@
     "@babel/runtime": "^7.12.1",
     "@polkadot/networks": "^4.0.0-6",
     "@polkadot/util": "^4.0.0-6",
-    "@polkadot/wasm-crypto": "^2.0.0-8",
+    "@polkadot/wasm-crypto": "^2.0.0-9",
     "@polkadot/x-randomvalues": "^4.0.0-6",
     "base-x": "^3.0.8",
     "blakejs": "^1.1.0",
diff --git a/packages/x-randomvalues/package.json b/packages/x-randomvalues/package.json
index 62f0c4294..cd9541077 100644
--- a/packages/x-randomvalues/package.json
+++ b/packages/x-randomvalues/package.json
@@ -25,5 +25,8 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/x-randomvalues#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.1"
+  },
+  "devDependencies": {
+    "@types/react-native": "^0.63.33"
   }
 }
diff --git a/packages/x-randomvalues/src/fallback.ts b/packages/x-randomvalues/src/fallback.ts
new file mode 100644
index 000000000..ffed5c922
--- /dev/null
+++ b/packages/x-randomvalues/src/fallback.ts
@@ -0,0 +1,27 @@
+// Copyright 2017-2020 @polkadot/x-randomvalues authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// Adapted from https://github.com/LinusU/react-native-get-random-values/blob/85f48393821c23b83b89a8177f56d3a81dc8b733/index.js
+// Copyright (c) 2018, 2020 Linus Unnebäck
+// SPDX-License-Identifier: MIT
+
+let warned = false;
+
+export default function insecureRandomValues <T extends Uint8Array> (arr: T): T {
+  if (!warned) {
+    console.warn('Using an insecure random number generator, this should only happen when running in a debugger without support for crypto.getRandomValues');
+    warned = true;
+  }
+
+  let r = 0;
+
+  for (let i = 0; i < arr.length; i++) {
+    if ((i & 0x03) === 0) {
+      r = Math.random() * 0x100000000;
+    }
+
+    arr[i] = (r >>> ((i & 0x03) << 3)) & 0xff;
+  }
+
+  return arr;
+}
diff --git a/packages/x-randomvalues/src/react-native.ts b/packages/x-randomvalues/src/react-native.ts
index d455e56c2..f9321e864 100644
--- a/packages/x-randomvalues/src/react-native.ts
+++ b/packages/x-randomvalues/src/react-native.ts
@@ -1,6 +1,40 @@
 // Copyright 2017-2020 @polkadot/x-randomvalues authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import getRandomValues from './node';
+// Adapted from https://github.com/LinusU/react-native-get-random-values/blob/85f48393821c23b83b89a8177f56d3a81dc8b733/index.js
+// Copyright (c) 2018, 2020 Linus Unnebäck
+// SPDX-License-Identifier: MIT
 
-export default getRandomValues;
+import { NativeModules } from 'react-native';
+
+import insecureRandomValues from './fallback';
+
+interface RNExt {
+  RNGetRandomValues: {
+    getRandomBase64: (length: number) => string;
+  }
+}
+
+function getRandomValuesNative <T extends Uint8Array> (arr: T): T {
+  // We may want to use a base64 decoder here, but we certainly have an issue where we
+  // want/need this part as lean as possible. Since Buffer is already needed elsewhere
+  // (an generally prevalent in JS), we rather use it as-is.
+  return Buffer
+    .from((NativeModules as RNExt).RNGetRandomValues.getRandomBase64(arr.length), 'base64')
+    .reduce((arr, byte, index): T => {
+      arr[index] = byte;
+
+      return arr;
+    }, arr);
+}
+
+function getRandomValuesGlobal <T extends Uint8Array> (arr: T): T {
+  return crypto.getRandomValues(arr);
+}
+
+export default typeof global.crypto === 'object' && typeof global.crypto.getRandomValues === 'function'
+  ? getRandomValuesGlobal
+  // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access,@typescript-eslint/no-explicit-any
+  : (typeof (global as any).nativeCallSyncHook === 'undefined' || !NativeModules.ExpoRandom)
+    ? insecureRandomValues
+    : getRandomValuesNative;
diff --git a/packages/x-textdecoder/src/browser.ts b/packages/x-textdecoder/src/browser.ts
index 386f74689..a914b06d2 100644
--- a/packages/x-textdecoder/src/browser.ts
+++ b/packages/x-textdecoder/src/browser.ts
@@ -1,17 +1,8 @@
 // Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-export default typeof TextDecoder === 'undefined'
-  ? class {
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars,no-useless-constructor
-    constructor (_: 'utf-8') {
-      // nothing
-    }
+import Fallback from './fallback';
 
-    decode (value: Uint8Array): string {
-      return value.reduce((str, code): string => {
-        return str + String.fromCharCode(code);
-      }, '');
-    }
-  }
+export default typeof TextDecoder === 'undefined'
+  ? Fallback
   : TextDecoder;
diff --git a/packages/x-textdecoder/src/fallback.ts b/packages/x-textdecoder/src/fallback.ts
new file mode 100644
index 000000000..dad31b2c2
--- /dev/null
+++ b/packages/x-textdecoder/src/fallback.ts
@@ -0,0 +1,15 @@
+// Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export default class TextDecoder {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars,no-useless-constructor
+  constructor (_: 'utf-8') {
+    // nothing
+  }
+
+  decode (value: Uint8Array): string {
+    return value.reduce((str, code): string => {
+      return str + String.fromCharCode(code);
+    }, '');
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index 03304fc7c..4afe3aedf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1861,7 +1861,7 @@ __metadata:
     "@babel/runtime": ^7.12.1
     "@polkadot/networks": ^4.0.0-6
     "@polkadot/util": ^4.0.0-6
-    "@polkadot/wasm-crypto": ^2.0.0-8
+    "@polkadot/wasm-crypto": ^2.0.0-9
     "@polkadot/x-randomvalues": ^4.0.0-6
     "@types/bn.js": ^4.11.6
     "@types/create-hash": ^1.2.2
@@ -1896,12 +1896,13 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/wasm-crypto@npm:^2.0.0-8":
-  version: 2.0.0-8
-  resolution: "@polkadot/wasm-crypto@npm:2.0.0-8"
+"@polkadot/wasm-crypto@npm:^2.0.0-9":
+  version: 2.0.0-9
+  resolution: "@polkadot/wasm-crypto@npm:2.0.0-9"
   peerDependencies:
     "@polkadot/util": "*"
-  checksum: ae064e32aaeff796cf1b24365e8a03bbe3f1c8612562095105b5b7391ee8ac138b9b8720dca192ccb870eb5e180f06a64ea0a405e177187cc1941e745975ca91
+    "@polkadot/x-randomvalues": "*"
+  checksum: 7bbe141f926f4cd4d0d03b0d187fb6ab8efb668a0bc28f489bd6a60316136d300d02a6c85b8ddc9466c7ee06abd4a347f1255c9d96feb82bd421f7a7e39b7111
   languageName: node
   linkType: hard
 
@@ -1920,6 +1921,7 @@ __metadata:
   resolution: "@polkadot/x-randomvalues@workspace:packages/x-randomvalues"
   dependencies:
     "@babel/runtime": ^7.12.1
+    "@types/react-native": ^0.63.33
   languageName: unknown
   linkType: soft
 
@@ -2198,6 +2200,32 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/prop-types@npm:*":
+  version: 15.7.3
+  resolution: "@types/prop-types@npm:15.7.3"
+  checksum: bd0eab69d5120ad3784d0c9985f902653d5924707a7f2b3702a330e762dfd61b6494954cb54ad0c52b918ffd6f1e7e27c9270e4442bc15250de348596f2f60cb
+  languageName: node
+  linkType: hard
+
+"@types/react-native@npm:^0.63.33":
+  version: 0.63.33
+  resolution: "@types/react-native@npm:0.63.33"
+  dependencies:
+    "@types/react": "*"
+  checksum: ac6f202902f2d2e2c938b120a3175fd1f61e337c709373ad6c1d7e716ad6e863ee71693744cf73cb0f75b311f86497bcaea06ea15cb896e684138327e14bae65
+  languageName: node
+  linkType: hard
+
+"@types/react@npm:*":
+  version: 16.9.56
+  resolution: "@types/react@npm:16.9.56"
+  dependencies:
+    "@types/prop-types": "*"
+    csstype: ^3.0.2
+  checksum: 139867e2b3d577723b9361234f105d0cf1b143202f51fef207355332f972dd74030cfb3918037cb311eefd203ee06e0a370c37755204eefdd35734f0fde070a1
+  languageName: node
+  linkType: hard
+
 "@types/responselike@npm:^1.0.0":
   version: 1.0.0
   resolution: "@types/responselike@npm:1.0.0"
@@ -3674,6 +3702,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"csstype@npm:^3.0.2":
+  version: 3.0.4
+  resolution: "csstype@npm:3.0.4"
+  checksum: 90cd2ff9aced9049010c5c69470b30643761d511b4250f6ce2bbdbab23229822c325fd841be6066a94a9ba800112026e3c046be879cd44a066e8705991cdc700
+  languageName: node
+  linkType: hard
+
 "cuint@npm:^0.2.2":
   version: 0.2.2
   resolution: "cuint@npm:0.2.2"