diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 000000000..6c5049e25
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 000000000..3ea567733
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,26 @@
+name: CI
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6.0.2
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v2.0.4
+        with:
+          deno-version: v2.x
+          cache: true
+
+      - name: Check formatter, linter, and types
+        run: deno task check
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 0da831b3c..a10b14afd 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -3,26 +3,35 @@ name: Update APIs
 permissions:
   contents: write
   pages: write
+  id-token: write
 
 on:
   schedule:
     - cron: "0 0 * * *"
   workflow_dispatch:
 
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
 jobs:
   update:
     runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6.0.2
 
       - name: Setup Deno
-        uses: denoland/setup-deno@v1
+        uses: denoland/setup-deno@v2.0.4
         with:
-          deno-version: v1.x
+          deno-version: v2.x
+          cache: true
 
       - name: Run fetcher script
-        run: deno run --allow-net --allow-read --allow-write fetcher.ts
+        run: deno task update
 
       - name: Format README.md
         run: deno fmt README.md
@@ -32,12 +41,18 @@ jobs:
           git config --local user.email "action@github.com"
           git config --local user.name "GitHub Action"
           git add .
-          git commit -m ":card_file_box: Update APIs: $(date +'%Y-%m-%d')" || exit 0
-          git push
-
-      - name: Publish to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v4
+          if git diff --cached --quiet; then
+            echo "No API changes to commit"
+          else
+            git commit -m ":card_file_box: Update APIs: $(date +'%Y-%m-%d')"
+            git push
+          fi
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v5.0.0
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./
-          force_orphan: true
+          path: ./
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v5.0.0
diff --git a/deno.json b/deno.json
new file mode 100644
index 000000000..4fe058a5c
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,10 @@
+{
+  "tasks": {
+    "update": "deno run --allow-net --allow-read --allow-write fetcher.ts",
+    "check": "deno fmt --check fetcher.ts .github && deno lint fetcher.ts && deno check fetcher.ts"
+  },
+  "imports": {
+    "@std/fs/ensure-dir": "jsr:@std/fs@1.0.23/ensure-dir",
+    "slugify": "https://deno.land/x/slugify@0.3.0/mod.ts"
+  }
+}
diff --git a/deno.lock b/deno.lock
new file mode 100644
index 000000000..bac3e266e
--- /dev/null
+++ b/deno.lock
@@ -0,0 +1,19 @@
+{
+  "version": "5",
+  "specifiers": {
+    "jsr:@std/fs@1.0.23": "1.0.23"
+  },
+  "jsr": {
+    "@std/fs@1.0.23": {
+      "integrity": "3ecbae4ce4fee03b180fa710caff36bb5adb66631c46a6460aaad49515565a37"
+    }
+  },
+  "remote": {
+    "https://deno.land/x/slugify@0.3.0/mod.ts": "a862dd4af7aac637a44bb3a3507acaca4b52386f8bebf4483b5a43e9458af315"
+  },
+  "workspace": {
+    "dependencies": [
+      "jsr:@std/fs@1.0.23"
+    ]
+  }
+}
diff --git a/fetcher.ts b/fetcher.ts
index 600ca8ac3..1eca00b39 100644
--- a/fetcher.ts
+++ b/fetcher.ts
@@ -1,5 +1,5 @@
-import { ensureDir } from "https://deno.land/std@0.224.0/fs/ensure_dir.ts";
-import { slugify } from "https://deno.land/x/slugify/mod.ts";
+import { ensureDir } from "@std/fs/ensure-dir";
+import { slugify } from "slugify";
 
 const indexName = "YCCompany_By_Launch_Date_production";
 const applicationId = "45BWZJ1SGC";
@@ -57,9 +57,15 @@ interface LaunchedCompany {
   question_answers: boolean;
 }
 
+type CompanyResult = LaunchedCompany & {
+  url: string;
+  api: string;
+};
+
 const fetchAllCompanies = async (): Promise<LaunchedCompany[]> => {
   const algoliaApiKey = await getAlgoliaApiKey();
-  const baseUrl = `https://${applicationId.toLowerCase()}-dsn.algolia.net/1/indexes/*/queries`;
+  const baseUrl =
+    `https://${applicationId.toLowerCase()}-dsn.algolia.net/1/indexes/*/queries`;
   const params = new URLSearchParams({
     "x-algolia-agent":
       "Algolia for JavaScript (3.35.1); Browser; JS Helper (3.16.1)",
@@ -74,7 +80,8 @@ const fetchAllCompanies = async (): Promise<LaunchedCompany[]> => {
       requests: [
         {
           indexName,
-          params: `facets=%5B%22app_answers%22%2C%22app_video_public%22%2C%22batch%22%2C%22demo_day_video_public%22%2C%22highlight_black%22%2C%22highlight_latinx%22%2C%22highlight_women%22%2C%22industries%22%2C%22isHiring%22%2C%22nonprofit%22%2C%22question_answers%22%2C%22regions%22%2C%22subindustry%22%2C%22tags%22%2C%22top_company%22%5D&hitsPerPage=1000&maxValuesPerFacet=1000&query=&tagFilters=`,
+          params:
+            `facets=%5B%22app_answers%22%2C%22app_video_public%22%2C%22batch%22%2C%22demo_day_video_public%22%2C%22highlight_black%22%2C%22highlight_latinx%22%2C%22highlight_women%22%2C%22industries%22%2C%22isHiring%22%2C%22nonprofit%22%2C%22question_answers%22%2C%22regions%22%2C%22subindustry%22%2C%22tags%22%2C%22top_company%22%5D&hitsPerPage=1000&maxValuesPerFacet=1000&query=&tagFilters=`,
         },
       ],
     }),
@@ -108,9 +115,12 @@ const fetchAllCompanies = async (): Promise<LaunchedCompany[]> => {
           requests: [
             {
               indexName,
-              params: `facets=%5B%22app_answers%22%2C%22app_video_public%22%2C%22batch%22%2C%22demo_day_video_public%22%2C%22highlight_black%22%2C%22highlight_latinx%22%2C%22highlight_women%22%2C%22industries%22%2C%22isHiring%22%2C%22nonprofit%22%2C%22question_answers%22%2C%22regions%22%2C%22subindustry%22%2C%22tags%22%2C%22top_company%22%5D&hitsPerPage=1000&maxValuesPerFacet=1000&query=&tagFilters=&facetFilters=batch:${encodeURIComponent(
-                batch
-              )}&page=${page}`,
+              params:
+                `facets=%5B%22app_answers%22%2C%22app_video_public%22%2C%22batch%22%2C%22demo_day_video_public%22%2C%22highlight_black%22%2C%22highlight_latinx%22%2C%22highlight_women%22%2C%22industries%22%2C%22isHiring%22%2C%22nonprofit%22%2C%22question_answers%22%2C%22regions%22%2C%22subindustry%22%2C%22tags%22%2C%22top_company%22%5D&hitsPerPage=1000&maxValuesPerFacet=1000&query=&tagFilters=&facetFilters=batch:${
+                  encodeURIComponent(
+                    batch,
+                  )
+                }&page=${page}`,
             },
           ],
         }),
@@ -118,14 +128,18 @@ const fetchAllCompanies = async (): Promise<LaunchedCompany[]> => {
       if (!batchRes.ok) {
         const body = await batchRes.text();
         throw new Error(
-          `Algolia batch request failed for ${batch}: ${batchRes.status} ${body}`
+          `Algolia batch request failed for ${batch}: ${batchRes.status} ${body}`,
         );
       }
 
       const batchJson = await batchRes.json();
-      const batchHits = batchJson.results?.[0]?.hits as LaunchedCompany[] | undefined;
+      const batchHits = batchJson.results?.[0]?.hits as
+        | LaunchedCompany[]
+        | undefined;
       if (!batchHits) {
-        throw new Error(`Algolia batch response did not include hits for ${batch}`);
+        throw new Error(
+          `Algolia batch response did not include hits for ${batch}`,
+        );
       }
       allCompanies = allCompanies.concat(batchHits);
       fetchedCount += batchHits.length;
@@ -141,7 +155,7 @@ await ensureDir("industries");
 await ensureDir("batches");
 
 const companies = await fetchAllCompanies();
-const results = companies.map((hit) => {
+const results: CompanyResult[] = companies.map((hit) => {
   if (typeof hit !== "object") throw new Error("Result is not of type object");
   if (hit === null) throw new Error("Object is of type null");
   if ("_highlightResult" in hit) delete hit._highlightResult;
@@ -149,12 +163,14 @@ const results = companies.map((hit) => {
   return {
     ...hit,
     url: `https://www.ycombinator.com/companies/${hit.slug}`,
-    api: `https://yc-oss.github.io/api/batches/${slugify(
-      hit.batch ?? "Unspecified",
-      {
-        lower: true,
-      }
-    )}/${hit.slug}.json`,
+    api: `https://yc-oss.github.io/api/batches/${
+      slugify(
+        hit.batch ?? "Unspecified",
+        {
+          lower: true,
+        },
+      )
+    }/${hit.slug}.json`,
   };
 });
 
@@ -176,7 +192,7 @@ const meta: Record<
 
 await Deno.writeTextFile(
   "companies/all.json",
-  JSON.stringify(results, null, 2) + "\n"
+  JSON.stringify(results, null, 2) + "\n",
 );
 
 const uniqueTags = Array.from(new Set(results.flatMap((result) => result.tags)))
@@ -196,7 +212,7 @@ for (const tag of uniqueTags) {
   );
   await Deno.writeTextFile(
     `tags/${tag.slug}.json`,
-    JSON.stringify(filteredResults, null, 2) + "\n"
+    JSON.stringify(filteredResults, null, 2) + "\n",
   );
   meta.tags[tag.slug] = {
     name: tag.name,
@@ -206,7 +222,7 @@ for (const tag of uniqueTags) {
 }
 
 const uniqueIndustries = Array.from(
-  new Set(results.flatMap((result) => result.industries))
+  new Set(results.flatMap((result) => result.industries)),
 )
   .map((industry) => {
     const slug = slugify(industry, { lower: true });
@@ -224,7 +240,7 @@ for (const industry of uniqueIndustries) {
   );
   await Deno.writeTextFile(
     `industries/${industry.slug}.json`,
-    JSON.stringify(filteredResults, null, 2) + "\n"
+    JSON.stringify(filteredResults, null, 2) + "\n",
   );
   meta.industries[industry.slug] = {
     name: industry.name,
@@ -268,11 +284,11 @@ const uniqueBatches = Array.from(new Set(results.map((result) => result.batch)))
 
 for (const batch of uniqueBatches) {
   const filteredResults = results.filter(
-    (result) => result.batch === batch.name
+    (result) => result.batch === batch.name,
   );
   await Deno.writeTextFile(
     `batches/${batch.slug}.json`,
-    JSON.stringify(filteredResults, null, 2) + "\n"
+    JSON.stringify(filteredResults, null, 2) + "\n",
   );
   meta.batches[batch.slug] = {
     name: batch.name,
@@ -281,7 +297,7 @@ for (const batch of uniqueBatches) {
   };
 }
 
-for (const { key, slug, name } of [
+const companyBooleanFilters = [
   { key: "top_company", slug: "top", name: "Top companies" },
   {
     key: "highlight_black",
@@ -300,11 +316,25 @@ for (const { key, slug, name } of [
   },
   { key: "nonprofit", slug: "nonprofit", name: "Not-for-profit companies" },
   { key: "isHiring", slug: "hiring", name: "Companies currently hiring" },
-]) {
+] as const satisfies ReadonlyArray<{
+  key: keyof Pick<
+    CompanyResult,
+    | "top_company"
+    | "highlight_black"
+    | "highlight_latinx"
+    | "highlight_women"
+    | "nonprofit"
+    | "isHiring"
+  >;
+  slug: string;
+  name: string;
+}>;
+
+for (const { key, slug, name } of companyBooleanFilters) {
   const filteredResults = results.filter((result) => result[key]);
   await Deno.writeTextFile(
     `companies/${slug}.json`,
-    JSON.stringify(filteredResults, null, 2) + "\n"
+    JSON.stringify(filteredResults, null, 2) + "\n",
   );
   meta.companies[slug] = {
     name,
@@ -315,20 +345,27 @@ for (const { key, slug, name } of [
 
 for (const company of results) {
   await ensureDir(
-    `batches/${slugify(company.batch ?? "Unspecified", {
-      lower: true,
-    })}`
+    `batches/${
+      slugify(company.batch ?? "Unspecified", {
+        lower: true,
+      })
+    }`,
   );
   await Deno.writeTextFile(
-    `batches/${slugify(company.batch ?? "Unspecified", {
-      lower: true,
-    })}/${company.slug}.json`,
-    JSON.stringify(company, null, 2) + "\n"
+    `batches/${
+      slugify(company.batch ?? "Unspecified", {
+        lower: true,
+      })
+    }/${company.slug}.json`,
+    JSON.stringify(company, null, 2) + "\n",
   );
 }
 
-const existingMeta = JSON.parse(await Deno.readTextFile("meta.json"));
-const newMeta = {
+const existingMeta = JSON.parse(await Deno.readTextFile("meta.json")) as Record<
+  string,
+  unknown
+>;
+const newMeta: Record<string, unknown> = {
   last_updated: new Date().toISOString(),
   readme: "https://github.com/yc-oss/api",
   ...meta,
@@ -344,7 +381,7 @@ if (hasChanges) {
   console.log("Meta has changed, updating meta.json");
   await Deno.writeTextFile(
     "meta.json",
-    JSON.stringify(newMeta, null, 2) + "\n"
+    JSON.stringify(newMeta, null, 2) + "\n",
   );
 
   const readme = await Deno.readTextFile("README.md");
@@ -352,10 +389,12 @@ if (hasChanges) {
 
   text += `\n## ℹ️ Metadata\n\n`;
   text += `API endpoint: https://yc-oss.github.io/api/meta.json\n\n`;
-  text += `- Last updated: ${new Date().toLocaleString("en-US", {
-    dateStyle: "long",
-    timeStyle: "short",
-  })}\n`;
+  text += `- Last updated: ${
+    new Date().toLocaleString("en-US", {
+      dateStyle: "long",
+      timeStyle: "short",
+    })
+  }\n`;
   text += `- Companies: ${results.length}\n`;
   text += `- Batches: ${uniqueBatches.length}\n`;
   text += `- Industries: ${uniqueIndustries.length}\n`;
@@ -363,26 +402,38 @@ if (hasChanges) {
 
   text += `\n## 💻 APIs\n\n`;
 
-  text += `\n### 🏢 Companies\n\n| List of companies | API endpoint |\n| --------------- | ------------ |\n`;
+  text +=
+    `\n### 🏢 Companies\n\n| List of companies | API endpoint |\n| --------------- | ------------ |\n`;
   for (const slug of Object.keys(meta.companies)) {
-    text += `| ${meta.companies[slug].name} | https://yc-oss.github.io/api/companies/${slug}.json |\n`;
+    text += `| ${
+      meta.companies[slug].name
+    } | https://yc-oss.github.io/api/companies/${slug}.json |\n`;
   }
 
-  text += `\n### 🎓 Batches\n\n<details>\n<summary>Companies per batch</summary>\n\n| Batch | Count | API endpoint |\n| ---- | ---- | ------------ |\n`;
+  text +=
+    `\n### 🎓 Batches\n\n<details>\n<summary>Companies per batch</summary>\n\n| Batch | Count | API endpoint |\n| ---- | ---- | ------------ |\n`;
   for (const slug of Object.keys(meta.batches)) {
-    text += `| ${meta.batches[slug].name} | ${meta.batches[slug].count} | https://yc-oss.github.io/api/batches/${slug}.json |\n`;
+    text += `| ${meta.batches[slug].name} | ${
+      meta.batches[slug].count
+    } | https://yc-oss.github.io/api/batches/${slug}.json |\n`;
   }
   text += `</details>\n`;
 
-  text += `\n### 🏭 Industries\n\n<details>\n<summary>Companies per industry</summary>\n\n| Industry | Count | API endpoint |\n| -------- | ---- | ------------ |\n`;
+  text +=
+    `\n### 🏭 Industries\n\n<details>\n<summary>Companies per industry</summary>\n\n| Industry | Count | API endpoint |\n| -------- | ---- | ------------ |\n`;
   for (const slug of Object.keys(meta.industries)) {
-    text += `| ${meta.industries[slug].name} | ${meta.industries[slug].count} | https://yc-oss.github.io/api/industries/${slug}.json |\n`;
+    text += `| ${meta.industries[slug].name} | ${
+      meta.industries[slug].count
+    } | https://yc-oss.github.io/api/industries/${slug}.json |\n`;
   }
   text += `</details>\n`;
 
-  text += `\n### 🏷️ Tags\n\n<details>\n<summary>Companies per tag</summary>\n\n| Tag | Count | API endpoint |\n| --- | ---- | ------------ |\n`;
+  text +=
+    `\n### 🏷️ Tags\n\n<details>\n<summary>Companies per tag</summary>\n\n| Tag | Count | API endpoint |\n| --- | ---- | ------------ |\n`;
   for (const slug of Object.keys(meta.tags)) {
-    text += `| ${meta.tags[slug].name} | ${meta.tags[slug].count} | https://yc-oss.github.io/api/tags/${slug}.json |\n`;
+    text += `| ${meta.tags[slug].name} | ${
+      meta.tags[slug].count
+    } | https://yc-oss.github.io/api/tags/${slug}.json |\n`;
   }
   text += `</details>\n`;
 
@@ -390,7 +441,7 @@ if (hasChanges) {
 
   const newReadme = readme.replace(
     /<!--start generated readme-->[\s\S]*<!--end generated readme-->/g,
-    text
+    text,
   );
   await Deno.writeTextFile("README.md", newReadme);
 } else console.log("Meta has not changed");