diff --git a/package-lock.json b/package-lock.json
index d26a755412..023e251acd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3724,7 +3724,8 @@
           "version": "2.1.1",
           "resolved": false,
           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -3748,13 +3749,15 @@
           "version": "1.0.0",
           "resolved": false,
           "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "resolved": false,
           "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -3771,19 +3774,22 @@
           "version": "1.1.0",
           "resolved": false,
           "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "resolved": false,
           "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "resolved": false,
           "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3914,7 +3920,8 @@
           "version": "2.0.3",
           "resolved": false,
           "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3928,6 +3935,7 @@
           "resolved": false,
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3944,6 +3952,7 @@
           "resolved": false,
           "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -3952,13 +3961,15 @@
           "version": "0.0.8",
           "resolved": false,
           "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "resolved": false,
           "integrity": "sha512-Gi1W4k059gyRbyVUZQ4mEqLm0YIUiGYfvxhF6SIlk3ui1WVxMTGfGdQ2SInh3PDrRTVvPKgULkpJtT4RH10+VA==",
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -3979,6 +3990,7 @@
           "resolved": false,
           "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4067,7 +4079,8 @@
           "version": "1.0.1",
           "resolved": false,
           "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4081,6 +4094,7 @@
           "resolved": false,
           "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -4176,7 +4190,8 @@
           "version": "5.1.2",
           "resolved": false,
           "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4218,6 +4233,7 @@
           "resolved": false,
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -4239,6 +4255,7 @@
           "resolved": false,
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4287,13 +4304,15 @@
           "version": "1.0.2",
           "resolved": false,
           "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "resolved": false,
           "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -4544,9 +4563,9 @@
       "dev": true
     },
     "immer": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/immer/-/immer-6.0.0.tgz",
-      "integrity": "sha512-vqOfnW3+VEV6vVxniMLPxTI+tEz1w7POYwOE1okOfnOS9Zl/mCObxino2lxiDC5l9o4NdWy+Rkxk9Em6ThBZBA=="
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-6.0.1.tgz",
+      "integrity": "sha512-oXwigCKgznQywsXi1VgrqgWbQEU3wievNCVc4Fcwky6mwXU6YHj6JuYp0WEM/B1EphkqsLr0x18lm5OiuemPcA=="
     },
     "import-fresh": {
       "version": "3.2.1",
diff --git a/package.json b/package.json
index a57060dd5c..a513d00505 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
     "src"
   ],
   "dependencies": {
-    "immer": "^6.0.0",
+    "immer": "^6.0.1",
     "redux": "^4.0.0",
     "redux-thunk": "^2.3.0",
     "reselect": "^4.0.0"
diff --git a/src/createAsyncThunk.test.ts b/src/createAsyncThunk.test.ts
index c6669623ae..c1a5c150a0 100644
--- a/src/createAsyncThunk.test.ts
+++ b/src/createAsyncThunk.test.ts
@@ -12,6 +12,12 @@ import {
   getLog
 } from 'console-testing-library/pure'
 
+declare global {
+  interface Window {
+    AbortController: AbortController
+  }
+}
+
 describe('createAsyncThunk', () => {
   it('creates the action types', () => {
     const thunkActionCreator = createAsyncThunk('testType', async () => 42)
@@ -416,7 +422,7 @@ describe('createAsyncThunk with abortController', () => {
   })
 
   describe('behaviour with missing AbortController', () => {
-    let keepAbortController: typeof AbortController
+    let keepAbortController: typeof window['AbortController']
     let freshlyLoadedModule: typeof import('./createAsyncThunk')
     let restore: () => void
     let nodeEnv: string