diff --git a/package.json b/package.json
index 18866ab0..9d0d827b 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "bootstrap": "lerna bootstrap",
     "clean": "lerna clean",
     "lint": "lerna run lint --stream",
+    "postinstall": "npm run bootstrap",
     "publish": "lerna publish",
     "test": "lerna run test --stream",
     "version": "conventional-changelog --pkg lerna.json -i CHANGELOG.md -s && git add CHANGELOG.md"
diff --git a/packages/api/__tests__/index.test.js b/packages/api/__tests__/index.test.js
index f4fb8544..062386a0 100644
--- a/packages/api/__tests__/index.test.js
+++ b/packages/api/__tests__/index.test.js
@@ -147,6 +147,25 @@ describe('#accessors', () => {
 describe('#fetch', () => {
   const petId = 123;
 
+  it('should reject for error-level status codes', () => {
+    expect.assertions(2);
+
+    const response = {
+      error: 'ENDPOINT_NOTFOUND',
+      message: `The endpoint you called (GET /pets/${petId}) doesn't exist`,
+    };
+
+    const mock = nock(petstoreServerUrl).delete(`/pets/${petId}`).reply(404, response);
+
+    return petstoreSdk.deletePet({ id: petId }).catch(async err => {
+      expect(err.status).toBe(404);
+
+      const json = await err.json();
+      expect(json).toStrictEqual(response);
+      mock.done();
+    });
+  });
+
   it('should contain a custom user agent for the library in requests', () => {
     expect.assertions(2);
 
diff --git a/packages/api/src/index.js b/packages/api/src/index.js
index 3ee41509..85e080e0 100644
--- a/packages/api/src/index.js
+++ b/packages/api/src/index.js
@@ -37,7 +37,13 @@ class Sdk {
     function fetchOperation(spec, operation, body, metadata) {
       const har = oasToHar(spec, operation, prepareParams(operation, body, metadata), prepareAuth(authKeys, operation));
 
-      return fetchHar(har, `${pkg.name} (node)/${pkg.version}`);
+      return fetchHar(har, `${pkg.name} (node)/${pkg.version}`).then(res => {
+        if (res.status >= 400 && res.status <= 599) {
+          throw res;
+        }
+
+        return res;
+      });
     }
 
     function loadMethods(spec) {