diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index a5bcabf..5102528 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,18 +10,18 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-node@v3
-      with:
-        node-version: 16
-    - run: npm i
-    - run: npm run lint
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 26
+      - run: npm i
+      - run: npm run lint
   test:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-node@v3
       with:
-        node-version: 16
+        node-version: 26
     - run: npm i
-    - run: npm t
+    - run: npm t -- --allow-incomplete-coverage
diff --git a/.github/workflows/test-gh.yml b/.github/workflows/test-gh.yml
index 9e20fe7..700d206 100644
--- a/.github/workflows/test-gh.yml
+++ b/.github/workflows/test-gh.yml
@@ -12,24 +12,26 @@ jobs:
       fail-fast: false
       matrix:
         container:
-        # Official Node.js images.
-        - node:12
-        - node:14
-        - node:16
-        # RHEL Node.js builds are icu_small without installing the
-        # optional nodejs-full-i18n rpm.
-        - registry.access.redhat.com/ubi8/nodejs-12
-        - registry.access.redhat.com/ubi8/nodejs-14
-        # - registry.access.redhat.com/ubi8/nodejs-16
-        - node:12-slim
+          # Official Node.js images.
+          - node:22
+          - node:24
+          - node:26
+          # RHEL Node.js builds are icu_small without installing the
+          # optional nodejs-full-i18n rpm.
+          - registry.access.redhat.com/ubi8/nodejs-22
+          - registry.access.redhat.com/ubi8/nodejs-24
+          #- registry.access.redhat.com/ubi8/nodejs-26
+          - node:22-slim
+          - node:24-slim
+          - node:26-slim
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/checkout@v3
-      with:
-        repository: nodejs/full-icu-test
-        path: full-icu-test
-    - name: Install full-icu
-      run: docker run --rm  -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} npm i --no-package-lock --unsafe-perm
-    - name: Test full-icu
-      run: docker run --rm -e NODE_ICU_DATA=. -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} node ./full-icu-test/test.js
+      - uses: actions/checkout@v3
+      - uses: actions/checkout@v3
+        with:
+          repository: nodejs/full-icu-test
+          path: full-icu-test
+      - name: Install full-icu
+        run: docker run --rm  -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} npm i --no-package-lock --unsafe-perm
+      - name: Test full-icu
+        run: docker run --rm -e NODE_ICU_DATA=. -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} node ./full-icu-test/test.js
diff --git a/.github/workflows/test-npm.yml b/.github/workflows/test-npm.yml
index c58a740..84a4eee 100644
--- a/.github/workflows/test-npm.yml
+++ b/.github/workflows/test-npm.yml
@@ -12,17 +12,23 @@ jobs:
       fail-fast: false
       matrix:
         container:
-        - node:12
-        - node:12-slim
-        # Will fail on versions that aren't in icu4c-data
+          - node:22
+          - node:22-slim
+          - node:24
+          - node:24-slim
+          - node:26
+          - node:26-slim
+          #- node:27
+          #- node:27-slim
+          # Will fail on versions that aren't in icu4c-data
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/checkout@v3
-      with:
-        repository: nodejs/full-icu-test
-        path: full-icu-test
-    - name: Install full-icu
-      run: docker run --rm  -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} env FULL_ICU_PREFER_NPM=1 npm i --no-package-lock --unsafe-perm
-    - name: Test full-icu
-      run: docker run --rm -e NODE_ICU_DATA=. -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} node ./full-icu-test/test.js
+      - uses: actions/checkout@v3
+      - uses: actions/checkout@v3
+        with:
+          repository: nodejs/full-icu-test
+          path: full-icu-test
+      - name: Install full-icu
+        run: docker run --rm  -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} env FULL_ICU_PREFER_NPM=1 npm i --no-package-lock --unsafe-perm
+      - name: Test full-icu
+        run: docker run --rm -e NODE_ICU_DATA=. -v $(pwd):/usr/src/app -w /usr/src/app  ${{ matrix.container }} node ./full-icu-test/test.js
diff --git a/.gitignore b/.gitignore
index 49c9602..0710237 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ npm-debug.log
 /yarn.lock
 package-lock.json
 /.nyc_output
+/.tap
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..0cc56a9
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,7 @@
+import globals from 'globals'
+import { defineConfig } from 'eslint/config'
+
+export default defineConfig([
+  { files: ['**/*.js'], languageOptions: { sourceType: 'commonjs' } },
+  { files: ['**/*.{js,mjs,cjs}'], languageOptions: { globals: globals.node } }
+])
diff --git a/full-icu.js b/full-icu.js
index 2792d86..e92e551 100644
--- a/full-icu.js
+++ b/full-icu.js
@@ -1,7 +1,6 @@
 // Copyright (C) 2015 IBM Corporation and Others. All Rights Reserved.
 
-// var process = require('process');
-// console.dir(process.env);
+// const process = require('process')
 
 const fs = require('fs')
 const path = require('path')
diff --git a/install-gh-data.js b/install-gh-data.js
index 9d13272..d89eccc 100644
--- a/install-gh-data.js
+++ b/install-gh-data.js
@@ -21,12 +21,13 @@ module.exports = async function installFromGithub (fullIcu, advice) {
   const _baseUrl = process.env.FULL_ICU_BASEURL || 'https://github.com/unicode-org/icu/releases/'
   const baseUrl = new URL(_baseUrl)
   const versionsAsHyphen = fullIcu.icuver.replace(/\./g, '-')
-  // ICU v67/v68 use "68.1" and "67.1" in the filename instead of 68_1 and 69_1
+  // ICU v67/v68 use "68.1" and "67.1" in the filename instead of 68_1 and 67_1
+  // ICU v69-v77 use underscores in the filename and hyphens in the tag
+  // ICU >= v78 reverted to dots in both the release tag and filename
   // https://unicode-org.atlassian.net/browse/ICU-21764
-  // Can remove this conditional if the files are updated later.
-  const versionsAsUnderscore = (fullIcu.icumaj >= 69) ? fullIcu.icuver.replace(/\./g, '_') : fullIcu.icuver
-  const tag = `release-${versionsAsHyphen}`
-  const file = `icu4c-${versionsAsUnderscore}-data-bin-${icuend}.zip`
+  const versionInFilename = (fullIcu.icumaj >= 78) ? fullIcu.icuver : (fullIcu.icumaj >= 69) ? fullIcu.icuver.replace(/\./g, '_') : fullIcu.icuver
+  const tag = (fullIcu.icumaj >= 78) ? `release-${fullIcu.icuver}` : `release-${versionsAsHyphen}`
+  const file = `icu4c-${versionInFilename}-data-bin-${icuend}.zip`
   const fullUrl = new URL(`./download/${tag}/${file}`, baseUrl)
   console.log(fullUrl.toString())
   const [srcZip, tmpd] = await myFetch(fullUrl)
diff --git a/package.json b/package.json
index d758487..aa2c8d0 100644
--- a/package.json
+++ b/package.json
@@ -28,13 +28,10 @@
     "yauzl": "^2.10.0"
   },
   "devDependencies": {
-    "eslint": "^8.44.0",
-    "eslint-config-standard": "^16.0.3",
-    "eslint-plugin-header": "^3.0.0",
-    "eslint-plugin-import": "^2.24.2",
-    "eslint-plugin-node": "^11.1.0",
-    "eslint-plugin-promise": "^6.1.1",
-    "standard": "^16.0.3",
-    "tap": "^16.3.4"
+    "@eslint/js": "^10.0.1",
+    "eslint": "^10.5.0",
+    "globals": "^17.6.0",
+    "standard": "^17.1.2",
+    "tap": "^21.7.4"
   }
 }