diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f1f331c3..1b8fbf6a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -55,10 +55,14 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2.1.0
+      - name: Install project
+        run: npm ci
+      - name: Build
+        run: npm run build
       - name: Renovate test
         uses: ./
         with:
-          configurationFile: .github/config.js
+          configurationFile: example/renovate-config.js
           token: ${{ secrets.RENOVATE_TOKEN }}
 
   build:
diff --git a/.github/workflows/example.yml b/.github/workflows/example.yml
deleted file mode 100644
index 630ae56f..00000000
--- a/.github/workflows/example.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-name: Example
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-jobs:
-  example:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2.1.0
-      - name: Renovate example
-        uses: ./
-        with:
-          configurationFile: example/config.js
-          token: ${{ secrets.RENOVATE_TOKEN }}
diff --git a/action.yml b/action.yml
index a1cb6010..f48c435d 100644
--- a/action.yml
+++ b/action.yml
@@ -15,8 +15,5 @@ inputs:
       configured using a Secret.
     required: true
 runs:
-  using: docker
-  image: src/Dockerfile
-  args:
-    - ${{ inputs.configurationFile }}
-    - ${{ inputs.token }}
+  using: node12
+  main: dist/index.js
diff --git a/example/config.js b/example/config.js
deleted file mode 100644
index e6b7683b..00000000
--- a/example/config.js
+++ /dev/null
@@ -1,9 +0,0 @@
-module.exports = {
-  branchPrefix: 'ga-renovate/',
-  dryRun: true,
-  gitAuthor: 'Renovate Bot <bot@renovateapp.com>',
-  logLevel: 'debug',
-  onboarding: false,
-  platform: 'github',
-  repositories: ['renovatebot/github-action'],
-};
diff --git a/.github/config.js b/example/renovate-config.js
similarity index 100%
rename from .github/config.js
rename to example/renovate-config.js
diff --git a/package-lock.json b/package-lock.json
index 9ce28f4f..af98a2ca 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,24 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@actions/core": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.4.tgz",
+      "integrity": "sha512-YJCEq8BE3CdN8+7HPZ/4DxJjk/OkZV2FFIf+DlZTC/4iBlzYCD5yjRR6eiOS5llO11zbRltIRuKAjMKaWTE6cg=="
+    },
+    "@actions/exec": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-1.0.4.tgz",
+      "integrity": "sha512-4DPChWow9yc9W3WqEbUj8Nr86xkpyE29ZzWjXucHItclLbEW6jr80Zx4nqv18QL6KK65+cifiQZXvnqgTV6oHw==",
+      "requires": {
+        "@actions/io": "^1.0.1"
+      }
+    },
+    "@actions/io": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@actions/io/-/io-1.0.2.tgz",
+      "integrity": "sha512-J8KuFqVPr3p6U8W93DOXlXW6zFvrQAJANdS+vw0YhusLIq+bszW8zmK2Fh1C2kDPX8FMvwIl1OUcFgvJoXLbAg=="
+    },
     "@babel/code-frame": {
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
@@ -308,6 +326,12 @@
       "integrity": "sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==",
       "dev": true
     },
+    "@types/node": {
+      "version": "13.13.4",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.13.4.tgz",
+      "integrity": "sha512-x26ur3dSXgv5AwKS0lNfbjpCakGIduWU1DU91Zz58ONRWrIKGunmZBNv4P7N+e27sJkiGDsw/3fT4AtsqQBrBA==",
+      "dev": true
+    },
     "@types/parse-json": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
diff --git a/package.json b/package.json
index 954889c5..217ef4f0 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.0.5",
   "description": "GitHub Action to run Renovate self-hosted.",
   "private": true,
+  "main": "dist/index.js",
   "scripts": {
     "lint": "concurrently npm:lint-es",
     "lint:fix": "concurrently npm:lint-es:fix",
@@ -16,7 +17,8 @@
     "release:changelog": "standard-version --dry-run --skip.commit=true --skip.tag=true",
     "release:commit": "git commit --allow-empty -m \"chore(release): trigger release process [ci release]\"",
     "release:message": "chalk -t \"Run {green.bold git push} to publish the release or {red.bold git reset HEAD^} to undo the release.\"",
-    "release": "run-s release:changelog release:commit release:message"
+    "release": "run-s release:changelog release:commit release:message",
+    "build": "tsc"
   },
   "repository": {
     "type": "git",
@@ -28,10 +30,14 @@
     "url": "https://github.com/renovatebot/github-action/issues"
   },
   "homepage": "https://github.com/renovatebot/github-action#readme",
-  "dependencies": {},
+  "dependencies": {
+    "@actions/core": "1.2.4",
+    "@actions/exec": "1.0.4"
+  },
   "devDependencies": {
     "@commitlint/cli": "8.3.5",
     "@commitlint/config-conventional": "8.3.4",
+    "@types/node": "13.13.4",
     "@typescript-eslint/eslint-plugin": "2.30.0",
     "@typescript-eslint/parser": "2.30.0",
     "chalk-cli": "4.1.0",
diff --git a/src/Dockerfile b/src/Dockerfile
deleted file mode 100644
index b52db8f7..00000000
--- a/src/Dockerfile
+++ /dev/null
@@ -1,5 +0,0 @@
-FROM renovate/renovate:19.228.2
-
-COPY entrypoint.sh /usr/entrypoint.sh
-
-ENTRYPOINT ["/usr/entrypoint.sh"]
diff --git a/src/docker.ts b/src/docker.ts
new file mode 100644
index 00000000..9d0a0c2b
--- /dev/null
+++ b/src/docker.ts
@@ -0,0 +1,15 @@
+class Docker {
+  readonly repository = 'renovate/renovate';
+  // renovate: datasource=docker depName=renovate/renovate versioning=docker
+  readonly tag = '19.228.1';
+
+  image(): string {
+    return `${this.repository}:${this.tag}`;
+  }
+
+  version(): string {
+    return this.tag;
+  }
+}
+
+export default Docker;
diff --git a/src/entrypoint.sh b/src/entrypoint.sh
deleted file mode 100755
index 5c1dab49..00000000
--- a/src/entrypoint.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/bin/bash
-#
-# Entrypoint for Docker.
-
-export RENOVATE_CONFIG_FILE="${GITHUB_WORKSPACE}/${1}"
-readonly _RENOVATE_TOKEN="${2}"
-
-# We are running as ubuntu, so no write access to /github/home
-export HOME=/home/ubuntu
-
-if [[ ! -f "${RENOVATE_CONFIG_FILE}" ]]; then
-  echo "ERROR: Couldn't find file ${RENOVATE_CONFIG_FILE}" 1>&2
-  exit 1
-fi
-
-# Run Renovate.
-#
-# Mimic the original ENTRYPOINT of the renovate/renovate Docker container. See
-# the following link for this entry.
-# https://github.com/renovatebot/docker-renovate/blob/d3aa0d99931ea7ad7e901a1e538eba0d61268229/Dockerfile#L63
-
-RENOVATE_TOKEN="${_RENOVATE_TOKEN}" /usr/local/bin/docker-entrypoint.sh
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 00000000..012c7f52
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,17 @@
+import * as core from '@actions/core';
+import Input from './input';
+import Renovate from './renovate';
+
+async function run(): Promise<void> {
+  try {
+    const input = new Input();
+    const renovate = new Renovate(input.configurationFile, input.token);
+
+    await renovate.runDockerContainer();
+  } catch (error) {
+    console.error(error);
+    core.setFailed(error.message);
+  }
+}
+
+run();
diff --git a/src/input.ts b/src/input.ts
new file mode 100644
index 00000000..207a394c
--- /dev/null
+++ b/src/input.ts
@@ -0,0 +1,20 @@
+import * as core from '@actions/core';
+
+class Input {
+  readonly configurationFile = core.getInput('configurationFile', {
+    required: true,
+  });
+  readonly token = core.getInput('token', { required: true });
+
+  constructor() {
+    this.validate();
+  }
+
+  validate(): void {
+    if (this.token === '') {
+      throw new Error('input.token MUST NOT be empty');
+    }
+  }
+}
+
+export default Input;
diff --git a/src/renovate.ts b/src/renovate.ts
new file mode 100644
index 00000000..c0048cb2
--- /dev/null
+++ b/src/renovate.ts
@@ -0,0 +1,55 @@
+import Docker from './docker';
+import { exec } from '@actions/exec';
+import fs from 'fs';
+import path from 'path';
+
+class Renovate {
+  private configFileEnv = 'RENOVATE_CONFIG_FILE';
+  private tokenEnv = 'RENOVATE_TOKEN';
+  private configFileMountDir = '/github-action';
+
+  private configFile: string;
+  private docker: Docker;
+
+  constructor(configFile: string, private token: string) {
+    this.configFile = path.resolve(configFile);
+
+    this.validateArguments();
+
+    this.docker = new Docker();
+  }
+
+  async runDockerContainer(): Promise<void> {
+    const commandArguments = [
+      '--rm',
+      `--env ${this.configFileEnv}=${this.configFileMountPath()}`,
+      `--env ${this.tokenEnv}=${this.token}`,
+      `--volume ${this.configFile}:${this.configFileMountPath()}`,
+      this.docker.image(),
+    ];
+    const command = `docker run ${commandArguments.join(' ')}`;
+
+    const code = await exec(command);
+    if (code !== 0) {
+      new Error(`'docker run' failed with exit code ${code}.`);
+    }
+  }
+
+  private validateArguments(): void {
+    if (!fs.existsSync(this.configFile)) {
+      throw new Error(
+        `Could not locate configuration file '${this.configFile}'.`
+      );
+    }
+  }
+
+  private configFileName(): string {
+    return path.basename(this.configFile);
+  }
+
+  private configFileMountPath(): string {
+    return path.join(this.configFileMountDir, this.configFileName());
+  }
+}
+
+export default Renovate;
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..7ed8f2e3
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "es2020",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "declaration": true,
+    "resolveJsonModule": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "outDir": "dist"
+  },
+  "include": ["src/**/*.ts", "bin/**/*.ts"],
+  "exclude": ["node_modules", "**/*.test.ts"]
+}