diff --git a/packages/react-native/src/BacktraceClient.ts b/packages/react-native/src/BacktraceClient.ts
index f5b589a3..e4f3c49f 100644
--- a/packages/react-native/src/BacktraceClient.ts
+++ b/packages/react-native/src/BacktraceClient.ts
@@ -14,6 +14,7 @@ import { FileBreadcrumbsStorage } from './breadcrumbs/FileBreadcrumbsStorage';
 import { BacktraceClientBuilder } from './builder/BacktraceClientBuilder';
 import type { BacktraceClientSetup } from './builder/BacktraceClientSetup';
 import { version } from './common/platformHelper';
+import { version as agentVersion } from '../package.json';
 import { CrashReporter } from './crashReporter/CrashReporter';
 import { generateUnhandledExceptionHandler } from './handlers';
 import { type ExceptionHandler } from './handlers/ExceptionHandler';
@@ -37,7 +38,7 @@ export class BacktraceClient extends BacktraceCoreClient<BacktraceConfiguration>
         super({
             sdkOptions: {
                 agent: '@backtrace/react-native',
-                agentVersion: '0.0.1',
+                agentVersion: agentVersion,
                 langName: 'react-native',
                 langVersion: version(),
             },
diff --git a/packages/sdk-core/rollup.config.mjs b/packages/sdk-core/rollup.config.mjs
index ca907643..026eae76 100644
--- a/packages/sdk-core/rollup.config.mjs
+++ b/packages/sdk-core/rollup.config.mjs
@@ -15,6 +15,7 @@ export default {
             sourcemap: true,
         },
     ],
-    external: [/node_modules/],
+    // bundle tslib so the ES5 output is self-contained
+    external: (id) => /node_modules/.test(id) && !/tslib/.test(id),
     plugins: [typescript({ tsconfig: './tsconfig.build.json' })],
 };
diff --git a/packages/sdk-core/tsconfig.build.json b/packages/sdk-core/tsconfig.build.json
index 889ce7cb..226f467c 100644
--- a/packages/sdk-core/tsconfig.build.json
+++ b/packages/sdk-core/tsconfig.build.json
@@ -4,7 +4,9 @@
     "compilerOptions": {
         "rootDir": "./src",
         "outDir": "./lib",
-        "target": "ESNext",
+        "target": "ES5",
+        "downlevelIteration": true,
+        "lib": ["ESNext"],
         "module": "NodeNext",
         "moduleResolution": "NodeNext"
     }
diff --git a/smoketests/tests/jest/node/tests.ts b/smoketests/tests/jest/node/tests.ts
index c277d892..54fce1e9 100644
--- a/smoketests/tests/jest/node/tests.ts
+++ b/smoketests/tests/jest/node/tests.ts
@@ -1,3 +1,5 @@
+// explicit import so jest matcher types win over expect-webdriverio's global expect
+import { expect } from '@jest/globals';
 import { npm } from '../../__helpers/npm.js';
 import { RXID_REGEX } from '../../__helpers/rxid.js';
 import { DIRECT_SUBMIT_URL, SUBMIT_LAYER_URL } from '../../__helpers/urls.js';
diff --git a/smoketests/wdio.conf.ts b/smoketests/wdio.conf.ts
index 95636288..2baaea1a 100644
--- a/smoketests/wdio.conf.ts
+++ b/smoketests/wdio.conf.ts
@@ -4,13 +4,6 @@ export const config: Options.Testrunner & {
     capabilities: WebdriverIO.Capabilities[];
 } = {
     runner: 'local',
-    autoCompileOpts: {
-        autoCompile: true,
-        tsNodeOpts: {
-            project: './tsconfig.json',
-            transpileOnly: true,
-        },
-    },
 
     user: process.env.SMOKETESTS_SAUCE_USERNAME,
     key: process.env.SMOKETESTS_SAUCE_ACCESS_KEY,