diff --git a/.travis.yml b/.travis.yml
index 1745d8396b..6fb7b5e2c4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: node_js
 node_js: node
 env:
   - TYPESCRIPT_VERSION=rc
+  - TYPESCRIPT_VERSION=3.8
   - TYPESCRIPT_VERSION=3.7
   - TYPESCRIPT_VERSION=3.6
   - TYPESCRIPT_VERSION=3.5
diff --git a/package-lock.json b/package-lock.json
index cc2fee0450..9d49a54173 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4528,9 +4528,9 @@
       "dev": true
     },
     "immer": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/immer/-/immer-4.0.1.tgz",
-      "integrity": "sha512-qZFpWApnbubcJ03gvWa6zUQz2OTkDc6yINdFXI1lm2IoMYsiVVMrxvfeLDURFhUGJfsQysDUjHSXYnJfMMHAwQ=="
+      "version": "6.0.0-alpha.4",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-6.0.0-alpha.4.tgz",
+      "integrity": "sha512-K0il++atEySb7NyWxodw430nJRhRrV7ojad0d9707ATLNVbCRLOpC949mdtsmY1aoUZd0+gebn3VmcwTdN534g=="
     },
     "import-fresh": {
       "version": "3.2.1",
@@ -6172,11 +6172,6 @@
       "dev": true,
       "optional": true
     },
-    "nanoid": {
-      "version": "2.1.11",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-2.1.11.tgz",
-      "integrity": "sha512-s/snB+WGm6uwi0WjsZdaVcuf3KJXlfGl2LcxgwkEwJF0D/BWzVWAZW/XY4bFaiR7s0Jk3FPvlnepg1H1b1UwlA=="
-    },
     "nanomatch": {
       "version": "1.2.13",
       "resolved": "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.13.tgz",
diff --git a/package.json b/package.json
index b5347df5ae..990aa45afd 100644
--- a/package.json
+++ b/package.json
@@ -57,8 +57,7 @@
     "src"
   ],
   "dependencies": {
-    "immer": "^4.0.1",
-    "nanoid": "^2.1.11",
+    "immer": "^6.0.0-alpha.4",
     "redux": "^4.0.0",
     "redux-thunk": "^2.3.0",
     "reselect": "^4.0.0"
diff --git a/src/createAsyncThunk.ts b/src/createAsyncThunk.ts
index eea94dd861..5c2ed4ea30 100644
--- a/src/createAsyncThunk.ts
+++ b/src/createAsyncThunk.ts
@@ -1,5 +1,4 @@
 import { Dispatch, AnyAction } from 'redux'
-import nanoid from 'nanoid'
 import {
   createAction,
   PayloadAction,
@@ -7,6 +6,7 @@ import {
 } from './createAction'
 import { ThunkDispatch } from 'redux-thunk'
 import { FallbackIfUnknown } from './tsHelpers'
+import { nanoid } from './nanoid'
 
 // @ts-ignore we need the import of these types due to a bundling issue.
 type _Keep = PayloadAction | ActionCreatorWithPreparedPayload<any, unknown>
diff --git a/src/index.ts b/src/index.ts
index 033b4abb0e..aa484c2f2d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,8 +1,15 @@
+import { enableES5 } from 'immer'
 export * from 'redux'
 export { default as createNextState, Draft } from 'immer'
 export { createSelector } from 'reselect'
 export { ThunkAction } from 'redux-thunk'
 
+// We deliberately enable Immer's ES5 support, on the grounds that
+// we assume RTK will be used with React Native and other Proxy-less
+// environments.  In addition, that's how Immer 4 behaved, and since
+// we want to ship this in an RTK minor, we should keep the same behavior.
+enableES5()
+
 export {
   // js
   configureStore,
diff --git a/src/nanoid.ts b/src/nanoid.ts
new file mode 100644
index 0000000000..a025110a8e
--- /dev/null
+++ b/src/nanoid.ts
@@ -0,0 +1,27 @@
+// Borrowed from https://github.com/ai/nanoid/tree/master/non-secure
+// This alphabet uses a-z A-Z 0-9 _- symbols.
+// Symbols are generated for smaller size.
+// -_zyxwvutsrqponmlkjihgfedcba9876543210ZYXWVUTSRQPONMLKJIHGFEDCBA
+let url = '-_'
+// Loop from 36 to 0 (from z to a and 9 to 0 in Base36).
+let i = 36
+while (i--) {
+  // 36 is radix. Number.prototype.toString(36) returns number
+  // in Base36 representation. Base36 is like hex, but it uses 0–9 and a-z.
+  url += i.toString(36)
+}
+// Loop from 36 to 10 (from Z to A in Base36).
+i = 36
+while (i-- - 10) {
+  url += i.toString(36).toUpperCase()
+}
+
+export function nanoid(size = 21) {
+  let id = ''
+  // Compact alternative for `for (var i = 0; i < size; i++)`
+  while (size--) {
+    // `| 0` is compact and faster alternative for `Math.floor()`
+    id += url[(Math.random() * 64) | 0]
+  }
+  return id
+}