diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 03ff60d..c476267 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,6 +7,8 @@ on:
   pull_request:
     branches:
       - main
+  schedule:
+    - cron: 0 0 * * *
 
 jobs:
   build:
diff --git a/README.md b/README.md
index 193fbb2..e02f868 100644
--- a/README.md
+++ b/README.md
@@ -25,24 +25,12 @@
 | `8.4.2`         |       🟢       |       🟢       |       🟢      |     🟢     |       🟢       |       🟢       |
 | `8.4.1`         |       🟢       |       🟢       |       🟢      |     🟢     |       🟢       |       🟢       |
 | `8.2.2` `8.2`   |       🟢       |       🟢       |       🟢      |     🟢     |       🟢       |       🟢       |
-| `8.2.1`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `8.0.2` `8.0`   |       🟢       |       🟢       |       🟢      |     🟢     |       🟢       |       🟢       |
-| `8.0.1`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.10.3` `7.10` |       🟢       |       🟢       |       🟢      |     🟢     |       🟢       |       🟢       |
-| `7.10.2`        |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.10.1`        |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.8.4` `7.8`   |       🟢       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.8.3`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.8.2`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.8.1`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.6.3` `7.6`   |       🟢       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.6.2`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.6.1`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.4.2` `7.4`   |       🟢       |       🟢       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.4.1`         |       🟢       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.2.2` `7.2`   |       🟢       |       🟢       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.2.1`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.0.4` `7.0`   |       🟢       |       🟢       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.0.3`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
-| `7.0.2`         |       ❌       |       ❌       |       ❌      |     ❌     |       ❌       |       ❌       |
 | `7.0.1`         |       🟢       |       🟢       |       ❌      |     ❌     |       ❌       |       ❌       |
diff --git a/generate/readme.ts b/generate/readme.ts
index 454704f..667edcf 100644
--- a/generate/readme.ts
+++ b/generate/readme.ts
@@ -1,36 +1,43 @@
+import * as fs from 'fs';
+import * as resolve from '../src/resolve';
 import { resolveVersion } from '../src/resolve';
-import { allSet, all, versions } from './versions';
-
-type Environment = keyof typeof versions;
-const environments: Environment[] = Object.keys(versions) as Environment[];
+import { versionMap } from './selftest';
 
 const code = (input: string) => '`' + input + '`';
+const majorVersion = (version: string) => version.split('.').splice(0, 2).join('.');
+const unique = (xs: string[]) => [...new Set(xs)];
 
-const supports = (version: string) => (name: Environment) => {
-  return versions[name].includes(version) ? 'oo' : 'xx';
-};
+async function main() {
+  const versions = await versionMap();
 
-const majorVersion = (version: string) => version.split('.').splice(0, 2).join('.');
+  type Environment = keyof typeof versions;
+  const environments: Environment[] = Object.keys(versions) as Environment[];
 
-const unique = (xs: string[]) => [...new Set(xs)];
+  const supports = (version: string) => (name: Environment) => {
+    return versions[name].has(version) ? 'oo' : 'xx';
+  };
 
-const latestMajorVersions = Object.fromEntries(
-  unique(all.map(majorVersion)).map(major => [resolveVersion(major, allSet), major])
-);
+  const allSet = new Set(Object.values(versions).map(x => Array.from(x)).flat());
+  const all = [...allSet].sort(resolve.compare);
 
-function codeVersion(version: string): string {
-  const major = latestMajorVersions[version];
-  return major ? `${code(version)} ${code(major)}` : code(version);
-}
+  const latestMajorVersions = Object.fromEntries(
+    unique(all.map(majorVersion)).map(major => [resolveVersion(major, allSet), major])
+  );
+
+  function codeVersion(version: string): string {
+    const major = latestMajorVersions[version];
+    return major ? `${code(version)} ${code(major)}` : code(version);
+  }
 
-async function main() {
   const { markdownTable } = await import('markdown-table');
   const header = [''].concat(environments.map(code));
   const align = ['l'].concat(environments.map(_ => 'c'));
   const row = (version: string) => [codeVersion(version)].concat(environments.map(supports(version)));
   const rows = all.reverse().map(row);
   const table = [header].concat(rows);
-  console.log(markdownTable(table, { align }).replace(/oo/g, '🟢').replace(/xx/g, '❌'));
+  fs.writeFileSync('README.md', markdownTable(table, { align }).replace(/oo/g, '🟢').replace(/xx/g, '❌') + '\n');
 }
 
-main();
+if (require.main === module) {
+  main();
+}
diff --git a/generate/selftest.ts b/generate/selftest.ts
index 229445b..d97462e 100644
--- a/generate/selftest.ts
+++ b/generate/selftest.ts
@@ -1,10 +1,32 @@
 import * as fs from 'fs';
 import * as YAML from 'yaml';
-import { versions } from './versions';
+import * as resolve from '../src/resolve';
 
-for (const [name, supported] of Object.entries(versions)) {
-  const file = `.github/workflows/selftest.${name}.yml`;
-  const yaml = YAML.parse(fs.readFileSync(file, 'utf8'));
-  yaml.jobs.build.strategy.matrix.ghc = supported;
-  fs.writeFileSync(file, YAML.stringify(yaml));
+import { ppa } from '../src/apt';
+import { list } from '../src/ghcup';
+
+export async function versionMap() {
+  const ghcup = await list();
+  return {
+    'ubuntu-18.04': new Set([...ppa.ubuntu18, ...ghcup]),
+    'ubuntu-20.04': new Set([...ppa.ubuntu20, ...ghcup]),
+    'macos-10.15': ghcup,
+    'macos-11': ghcup,
+    'windows-2019': ghcup,
+    'windows-2022': ghcup,
+  };
+}
+
+async function main() {
+  const versions = await versionMap();
+  for (const [name, supported] of Object.entries(versions)) {
+    const file = `.github/workflows/selftest.${name}.yml`;
+    const yaml = YAML.parse(fs.readFileSync(file, 'utf8'));
+    yaml.jobs.build.strategy.matrix.ghc = [...supported].sort(resolve.compare);
+    fs.writeFileSync(file, YAML.stringify(yaml));
+  }
+}
+
+if (require.main === module) {
+  main();
 }
diff --git a/generate/versions.ts b/generate/versions.ts
deleted file mode 100644
index 7a2a9e0..0000000
--- a/generate/versions.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import * as fs from 'fs';
-
-import { ppa } from '../src/apt';
-
-export const all: string[] = JSON.parse(fs.readFileSync('generate/versions/all.json', 'utf8'));
-export const allSet = new Set(all);
-
-const ghcup: string[] = JSON.parse(fs.readFileSync('generate/versions/ghcup.json', 'utf8'));
-const ghcupSet: Set<string> = new Set(ghcup);
-
-export const versions = {
-  'ubuntu-18.04': all.filter(version => ghcupSet.has(version) || ppa.ubuntu18.has(version)),
-  'ubuntu-20.04': all.filter(version => ghcupSet.has(version) || ppa.ubuntu20.has(version)),
-  'macos-10.15': ghcup,
-  'macos-11': ghcup,
-  'windows-2019': ghcup,
-  'windows-2022': ghcup,
-};
diff --git a/generate/versions/all.json b/generate/versions/all.json
deleted file mode 100644
index faacc9f..0000000
--- a/generate/versions/all.json
+++ /dev/null
@@ -1,48 +0,0 @@
-[
-  "7.0.1",
-  "7.0.2",
-  "7.0.3",
-  "7.0.4",
-  "7.2.1",
-  "7.2.2",
-  "7.4.1",
-  "7.4.2",
-  "7.6.1",
-  "7.6.2",
-  "7.6.3",
-  "7.8.1",
-  "7.8.2",
-  "7.8.3",
-  "7.8.4",
-  "7.10.1",
-  "7.10.2",
-  "7.10.3",
-  "8.0.1",
-  "8.0.2",
-  "8.2.1",
-  "8.2.2",
-  "8.4.1",
-  "8.4.2",
-  "8.4.3",
-  "8.4.4",
-  "8.6.1",
-  "8.6.2",
-  "8.6.3",
-  "8.6.4",
-  "8.6.5",
-  "8.8.1",
-  "8.8.2",
-  "8.8.3",
-  "8.8.4",
-  "8.10.1",
-  "8.10.2",
-  "8.10.3",
-  "8.10.4",
-  "8.10.5",
-  "8.10.6",
-  "8.10.7",
-  "9.0.1",
-  "9.0.2",
-  "9.2.1",
-  "9.2.2"
-]
diff --git a/generate/versions/ghcup.json b/generate/versions/ghcup.json
deleted file mode 100644
index 15d367d..0000000
--- a/generate/versions/ghcup.json
+++ /dev/null
@@ -1,29 +0,0 @@
-[
-  "7.10.3",
-  "8.0.2",
-  "8.2.2",
-  "8.4.1",
-  "8.4.2",
-  "8.4.3",
-  "8.4.4",
-  "8.6.1",
-  "8.6.2",
-  "8.6.3",
-  "8.6.4",
-  "8.6.5",
-  "8.8.1",
-  "8.8.2",
-  "8.8.3",
-  "8.8.4",
-  "8.10.1",
-  "8.10.2",
-  "8.10.3",
-  "8.10.4",
-  "8.10.5",
-  "8.10.6",
-  "8.10.7",
-  "9.0.1",
-  "9.0.2",
-  "9.2.1",
-  "9.2.2"
-]
diff --git a/package.json b/package.json
index 261c362..59fc1b9 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "private": true,
   "main": "build/main.js",
   "scripts": {
-    "build": "tsc && ncc build",
+    "build": "tsc && ncc build && ts-node generate/readme.ts && ts-node generate/selftest.ts",
     "test": "jest",
     "watch": "jest --config jest.config.fast.ts --watch"
   },
diff --git a/src/resolve.spec.ts b/src/resolve.spec.ts
index 6887b0c..e79cbce 100644
--- a/src/resolve.spec.ts
+++ b/src/resolve.spec.ts
@@ -1,9 +1,28 @@
-import { allSet } from '../generate/versions';
-
 import { compare, resolveVersion, resolve } from '../src/resolve';
 
 const context = describe;
 
+const allSet = new Set([
+  '7.6.1',
+  '7.6.2',
+  '7.6.3',
+  '7.8.1',
+  '7.8.2',
+  '7.8.3',
+  '7.8.4',
+  '7.10.1',
+  '7.10.2',
+  '7.10.3',
+  '8.0.1',
+  '8.0.2',
+  '8.2.1',
+  '8.2.2',
+  '8.4.1',
+  '8.4.2',
+  '8.4.3',
+  '8.4.4',
+]);
+
 describe('compare', () => {
   it('compares versions', () => {
     expect(compare('1.0', '1.2')).toBe(-1);