diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
new file mode 100644
index 0000000000..f31fef98a6
--- /dev/null
+++ b/.github/workflows/benchmarks.yml
@@ -0,0 +1,47 @@
+name: Benchmarks
+
+on: [pull_request]
+
+jobs:
+  benchmarks:
+    name: benchmarks
+
+    # We can't currently run benchmarks on PRs from forked repos, because the
+    # tachometer action reports results by posting a comment, and we can't post
+    # comments without a github token.
+    if: github.event.pull_request == null || github.event.pull_request.head.repo.full_name == github.repository
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - name: Restore node_modules
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          # Bump the number after `lit-1.x-node-modules` to force a cache
+          # update. Note there are multiple cache actions in `tests.yml` that
+          # should all keep keys in sync.
+          key: lit-1.x-node-modules-0-${{ runner.os }}-${{ hashFiles('package-lock.json') }}
+
+      - name: NPM install
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Benchmark
+        run: npx tach --config tachometer.json --json-file results.json
+
+      - name: Report
+        uses: andrewiggins/tachometer-reporter-action@v2
+        with:
+          path: results.json
+          pr-bench-name: this-change
+          base-bench-name: lit-html-1.x
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000000..a576475699
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,90 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - run: npm ci
+
+      - run: >-
+          npm run format && git diff --exit-code || (echo -e '\n\033[31mERROR:\033[0m
+          Project is not formatted. Please run "npm run format".' && false)
+
+  tests-local:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - name: Restore node_modules
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          # Bump the number after `lit-1.x-node-modules` to force a cache
+          # update. Note there are cache actions in other jobs in this file that
+          # should all keep keys in sync.
+          key: lit-1.x-node-modules-0-${{ runner.os }}-${{ hashFiles('package-lock.json') }}
+
+      - name: NPM install
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: npm ci
+
+      - name: Install XVFB
+        run: sudo apt-get install xvfb
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: xvfb-run npx wct --npm
+
+  tests-sauce:
+    # We can't run Sauce tests on PRs from forked repos, since they don't have
+    # access to secrets.
+    if: github.event.pull_request == null || github.event.pull_request.head.repo.full_name == github.repository
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - name: Restore node_modules
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          # Bump the number after `lit-1.x-node-modules` to force a cache
+          # update. Note there are cache actions in other jobs in this file that
+          # should all keep keys in sync.
+          key: lit-1.x-node-modules-0-${{ runner.os }}-${{ hashFiles('package-lock.json') }}
+
+      - name: NPM install
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        env:
+          SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
+          SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
+        run: npx wct -s 'windows 10/microsoftedge@17' -s 'windows 10/microsoftedge@15' -s 'macos 10.13/safari@11' -s 'macos 10.12/safari@10' -s 'windows 8.1/internet explorer@11' -s 'Linux/chrome@41' --npm
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index e3538e8d77..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-language: node_js
-sudo: false
-dist: xenial
-node_js: '10'
-addons:
-  firefox: "71.0"
-  chrome: stable
-cache:
-  directories:
-  - node_modules
-services:
-  - xvfb
-env:
-  global:
-  - secure: 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
-  - secure: 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
-matrix:
-  fast_finish: true
-  allow_failures:
-    - env: JOB=benchmark
-
-  include:
-    - env: JOB=test
-      before_script:
-        - >-
-          npm run format && git diff --exit-code || (echo -e '\n\033[31mERROR:\033[0m
-          Project is not formatted. Please run "npm run format".' && false)
-        - npm run build
-      script:
-        - wct --npm
-        - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s 'windows 10/microsoftedge@17' -s 'windows 10/microsoftedge@15' -s 'macos 10.13/safari@11' -s 'macos 10.12/safari@10' -s 'windows 8.1/internet explorer@11' -s 'Linux/chrome@41' --npm; fi
-
-    - env: JOB=benchmark
-      script:
-        - ./travis-bench.sh
diff --git a/README.md b/README.md
index 79d41bf120..7d8533da05 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # lit-html
 Efficient, Expressive, Extensible HTML templates in JavaScript
 
-[![Build Status](https://travis-ci.org/lit/lit.svg?branch=lit-html-1.4.x)](https://travis-ci.org/Polymer/lit-html)
+[![Build Status](https://github.com/lit/lit/actions/workflows/tests.yml/badge.svg?branch=lit-html-1.x)](https://github.com/lit/lit/actions/workflows/tests.yml?query=branch%3Alit-html-1.x)
 [![Published on npm](https://img.shields.io/npm/v/lit-html.svg)](https://www.npmjs.com/package/lit-html)
 [![Join our Slack](https://img.shields.io/badge/slack-join%20chat-4a154b.svg)](https://lit.dev/slack-invite/)
 [![Mentioned in Awesome Lit](https://awesome.re/mentioned-badge.svg)](https://github.com/web-padawan/awesome-lit)
diff --git a/package-lock.json b/package-lock.json
index cc4b947ff6..1fc8eac3bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "@webcomponents/shadycss": "^1.8.0",
         "@webcomponents/webcomponentsjs": "^2.4.2",
         "chai": "^4.1.2",
-        "chromedriver": "^84.0.1",
+        "chromedriver": "^91.0.1",
         "clang-format": "~1.2.4",
         "downlevel-dts": "^0.4.0",
         "eslint": "^6.8.0",
@@ -27,7 +27,7 @@
         "rollup": "^1.19.0",
         "rollup-plugin-filesize": "^6.2.0",
         "rollup-plugin-terser": "^5.2.0",
-        "tachometer": "^0.5.0",
+        "tachometer": "^0.5.9",
         "typescript": "~3.8.0",
         "uglify-es": "^3.3.5",
         "wct-mocha": "^1.1.0",
@@ -712,12 +712,12 @@
       }
     },
     "node_modules/@nodelib/fs.scandir": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
-      "integrity": "sha512-eGmwYQn3gxo4r7jdQnkrrN6bY478C3P+a/y72IJukF8LjB6ZHeB3c+Ehacj3sYeSmUXGlnA67/PmbM9CVwL7Dw==",
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
       "dev": true,
       "dependencies": {
-        "@nodelib/fs.stat": "2.0.3",
+        "@nodelib/fs.stat": "2.0.5",
         "run-parallel": "^1.1.9"
       },
       "engines": {
@@ -725,21 +725,21 @@
       }
     },
     "node_modules/@nodelib/fs.stat": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz",
-      "integrity": "sha512-bQBFruR2TAwoevBEd/NWMoAAtNGzTRgdrqnYCc7dhzfoNvqPzLyqlEQnzZ3kVnNrSp25iyxE00/3h2fqGAGArA==",
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
       "dev": true,
       "engines": {
         "node": ">= 8"
       }
     },
     "node_modules/@nodelib/fs.walk": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz",
-      "integrity": "sha512-1V9XOY4rDW0rehzbrcqAmHnz8e7SKvX27gh8Gt2WgB0+pdzdiLV83p72kZPU+jvMbS1qU5mauP2iOvO8rhmurQ==",
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.7.tgz",
+      "integrity": "sha512-BTIhocbPBSrRmHxOAJFtR18oLhxTtAFDAvL8hY1S3iU8k+E60W/YFs4jrixGzQjMpF4qPXxIQHcjVD9dz1C2QA==",
       "dev": true,
       "dependencies": {
-        "@nodelib/fs.scandir": "2.1.3",
+        "@nodelib/fs.scandir": "2.1.5",
         "fastq": "^1.6.0"
       },
       "engines": {
@@ -1201,9 +1201,9 @@
       }
     },
     "node_modules/@types/selenium-webdriver": {
-      "version": "4.0.9",
-      "resolved": "https://registry.npmjs.org/@types/selenium-webdriver/-/selenium-webdriver-4.0.9.tgz",
-      "integrity": "sha512-HopIwBE7GUXsscmt/J0DhnFXLSmO04AfxT6b8HAprknwka7pqEWquWDMXxCjd+NUHK9MkCe1SDKKsMiNmCItbQ==",
+      "version": "4.0.14",
+      "resolved": "https://registry.npmjs.org/@types/selenium-webdriver/-/selenium-webdriver-4.0.14.tgz",
+      "integrity": "sha512-jDe75y7dXpGH5teJI1cgJOhnC7/MsfqgLWbu2TuzJSv1DDn6FgaghEnRxEAbsqEsTzXMTCrottAHVJsQxL8gUw==",
       "dev": true
     },
     "node_modules/@types/serve-static": {
@@ -1226,10 +1226,14 @@
       }
     },
     "node_modules/@types/table": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/@types/table/-/table-5.0.0.tgz",
-      "integrity": "sha512-fQLtGLZXor264zUPWI95WNDsZ3QV43/c0lJpR/h1hhLJumXRmHNsrvBfEzW2YMhb0EWCsn4U6h82IgwsajAuTA==",
-      "dev": true
+      "version": "6.3.2",
+      "resolved": "https://registry.npmjs.org/@types/table/-/table-6.3.2.tgz",
+      "integrity": "sha512-GJ82z3vQbx2BhiUo12w2A3lyBpXPJrGHjQ7iS5aH925098w8ojqiWBhgOUy97JS2PKLmRCTLT0sI+gJI4futig==",
+      "deprecated": "This is a stub types definition. table provides its own type definitions, so you do not need this installed.",
+      "dev": true,
+      "dependencies": {
+        "table": "*"
+      }
     },
     "node_modules/@types/trusted-types": {
       "version": "1.0.4",
@@ -1447,9 +1451,9 @@
       }
     },
     "node_modules/aggregate-error": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.0.1.tgz",
-      "integrity": "sha512-quoaXsZ9/BLNae5yiNoUz+Nhkwz83GhWwtYFglcjEQB2NDHCIpApbqXxIFnm4Pq/Nvhrsq5sYJFyohrrxnTGAA==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
+      "integrity": "sha512-4I7Td01quW/RpocfNayFdFVk1qSuoh0E7JrbRJ16nH01HhKFQ88INq9Sd+nd72zqRySlr9BmDA8xlEJ6vJMrYA==",
       "dev": true,
       "dependencies": {
         "clean-stack": "^2.0.0",
@@ -1519,15 +1523,24 @@
       }
     },
     "node_modules/ansi-escape-sequences": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/ansi-escape-sequences/-/ansi-escape-sequences-5.1.2.tgz",
-      "integrity": "sha512-JcpoVp1W1bl1Qn4cVuiXEhD6+dyXKSOgCn2zlzE8inYgCJCBy1aPnUhlz6I4DFum8D4ovb9Qi/iAjUcGvG2lqw==",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-escape-sequences/-/ansi-escape-sequences-6.0.1.tgz",
+      "integrity": "sha512-/zxfA4yLP75kw2VOCJyNmxfZSEJ98Rd1ElgHeR29TxSOFVwbfv8aJEiTWAE68jNcedcFBwLt6Ywh+BaQWUfCBA==",
       "dev": true,
       "dependencies": {
-        "array-back": "^4.0.0"
+        "array-back": "^5.0.0"
       },
       "engines": {
-        "node": ">=8.0.0"
+        "node": ">=14"
+      }
+    },
+    "node_modules/ansi-escape-sequences/node_modules/array-back": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/array-back/-/array-back-5.0.0.tgz",
+      "integrity": "sha512-kgVWwJReZWmVuWOQKEOohXKJX+nD02JAZ54D1RRWlv8L0NebauKAaFxACKzB74RTclt1+WNz5KHaLRDAPZbDEw==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
       }
     },
     "node_modules/ansi-escapes": {
@@ -1876,12 +1889,12 @@
       "dev": true
     },
     "node_modules/axios": {
-      "version": "0.19.2",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.19.2.tgz",
-      "integrity": "sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==",
+      "version": "0.21.1",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.1.tgz",
+      "integrity": "sha512-dKQiRHxGD9PPRIUNIWvZhPTPpl1rf/OxTYKsqKUDjBwYylTvV7SjSHJb9ratfyzM6wCdLCOYLzs73qpg5c4iGA==",
       "dev": true,
       "dependencies": {
-        "follow-redirects": "1.5.10"
+        "follow-redirects": "^1.10.0"
       }
     },
     "node_modules/babel-code-frame": {
@@ -3072,17 +3085,18 @@
       }
     },
     "node_modules/chromedriver": {
-      "version": "84.0.1",
-      "resolved": "https://registry.npmjs.org/chromedriver/-/chromedriver-84.0.1.tgz",
-      "integrity": "sha512-iJ6Y680yp58+KlAPS5YgYe3oePVFf8jY5k4YoczhXkT0p/mQZKfGNkGG/Xc0LjGWDQRTgZwXg66hOXoApIQecg==",
+      "version": "91.0.1",
+      "resolved": "https://registry.npmjs.org/chromedriver/-/chromedriver-91.0.1.tgz",
+      "integrity": "sha512-9LktpHiUxM4UWUsr+jI1K1YKx2GENt6BKKJ2mibPj1Wc6ODzX/3fFIlr8CZ4Ftuyga+dHTTbAyPWKwKvybEbKA==",
       "dev": true,
+      "hasInstallScript": true,
       "dependencies": {
         "@testim/chrome-version": "^1.0.7",
-        "axios": "^0.19.2",
-        "del": "^5.1.0",
+        "axios": "^0.21.1",
+        "del": "^6.0.0",
         "extract-zip": "^2.0.1",
         "https-proxy-agent": "^5.0.0",
-        "mkdirp": "^1.0.4",
+        "proxy-from-env": "^1.1.0",
         "tcp-port-used": "^1.0.1"
       },
       "bin": {
@@ -3117,18 +3131,6 @@
         "node": ">= 6"
       }
     },
-    "node_modules/chromedriver/node_modules/mkdirp": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
-      "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==",
-      "dev": true,
-      "bin": {
-        "mkdirp": "bin/cmd.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -4195,22 +4197,25 @@
       }
     },
     "node_modules/del": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/del/-/del-5.1.0.tgz",
-      "integrity": "sha512-wH9xOVHnczo9jN2IW68BabcecVPxacIA3g/7z6vhSU/4stOKQzeCRK0yD0A24WiAAUJmmVpWqrERcTxnLo3AnA==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/del/-/del-6.0.0.tgz",
+      "integrity": "sha512-1shh9DQ23L16oXSZKB2JxpL7iMy2E0S9d517ptA1P8iw0alkPtQcrKH7ru31rYtKwF499HkTu+DRzq3TCKDFRQ==",
       "dev": true,
       "dependencies": {
-        "globby": "^10.0.1",
-        "graceful-fs": "^4.2.2",
+        "globby": "^11.0.1",
+        "graceful-fs": "^4.2.4",
         "is-glob": "^4.0.1",
         "is-path-cwd": "^2.2.0",
-        "is-path-inside": "^3.0.1",
-        "p-map": "^3.0.0",
-        "rimraf": "^3.0.0",
+        "is-path-inside": "^3.0.2",
+        "p-map": "^4.0.0",
+        "rimraf": "^3.0.2",
         "slash": "^3.0.0"
       },
       "engines": {
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+        },
         "semver": {
           "version": "7.3.2",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
           "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
           "dev": true
         },
+        "slice-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-4.0.0.tgz",
+          "integrity": "sha512-qMCMfhY040cVHT43K9BFygqYbUPFZKHOg7K73mtTWJRb8pyP3fzf4Ixd5SzdEJQ6MRUg/WBnOLxghZtKKurENQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.0.0",
+            "astral-regex": "^2.0.0",
+            "is-fullwidth-code-point": "^3.0.0"
+          }
+        },
         "strip-ansi": {
           "version": "6.0.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
@@ -27055,6 +27371,20 @@
           "requires": {
             "ansi-regex": "^5.0.0"
           }
+        },
+        "table": {
+          "version": "6.7.1",
+          "resolved": "https://registry.npmjs.org/table/-/table-6.7.1.tgz",
+          "integrity": "sha512-ZGum47Yi6KOOFDE8m223td53ath2enHcYLgOCjGr5ngu8bdIARQk6mN/wRMv4yMRcHnCSnHbCEha4sobQx5yWg==",
+          "dev": true,
+          "requires": {
+            "ajv": "^8.0.1",
+            "lodash.clonedeep": "^4.5.0",
+            "lodash.truncate": "^4.4.2",
+            "slice-ansi": "^4.0.0",
+            "string-width": "^4.2.0",
+            "strip-ansi": "^6.0.0"
+          }
         }
       }
     },
@@ -27351,6 +27681,15 @@
       "integrity": "sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw==",
       "dev": true
     },
+    "truncate-utf8-bytes": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/truncate-utf8-bytes/-/truncate-utf8-bytes-1.0.2.tgz",
+      "integrity": "sha1-QFkjkJWS1W94pYGENLC3hInKXys=",
+      "dev": true,
+      "requires": {
+        "utf8-byte-length": "^1.0.1"
+      }
+    },
     "tslib": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.11.1.tgz",
@@ -27777,6 +28116,12 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
+    "utf8-byte-length": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/utf8-byte-length/-/utf8-byte-length-1.0.4.tgz",
+      "integrity": "sha1-9F8VDExm7uloGGUFq5P8u4rWv2E=",
+      "dev": true
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -28402,10 +28747,11 @@
       }
     },
     "ws": {
-      "version": "7.2.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
-      "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ==",
-      "dev": true
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.0.tgz",
+      "integrity": "sha512-6ezXvzOZupqKj4jUqbQ9tXuJNo+BR2gU8fFRk3XCP3e0G6WT414u5ELe6Y0vtp7kmSJ3F7YWObSNr1ESsgi4vw==",
+      "dev": true,
+      "requires": {}
     },
     "xdg-basedir": {
       "version": "3.0.0",
diff --git a/package.json b/package.json
index e02702c0c1..7ba21e61bc 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
     "@webcomponents/shadycss": "^1.8.0",
     "@webcomponents/webcomponentsjs": "^2.4.2",
     "chai": "^4.1.2",
-    "chromedriver": "^84.0.1",
+    "chromedriver": "^91.0.1",
     "clang-format": "~1.2.4",
     "downlevel-dts": "^0.4.0",
     "eslint": "^6.8.0",
@@ -76,7 +76,7 @@
     "rollup": "^1.19.0",
     "rollup-plugin-filesize": "^6.2.0",
     "rollup-plugin-terser": "^5.2.0",
-    "tachometer": "^0.5.0",
+    "tachometer": "^0.5.9",
     "typescript": "~3.8.0",
     "uglify-es": "^3.3.5",
     "wct-mocha": "^1.1.0",
diff --git a/tachometer.json b/tachometer.json
new file mode 100644
index 0000000000..edcd8d9d57
--- /dev/null
+++ b/tachometer.json
@@ -0,0 +1,60 @@
+{
+  "$schema": "https://raw.githubusercontent.com/Polymer/tachometer/master/config.schema.json",
+  "sampleSize": 50,
+  "timeout": 3,
+  "horizons": ["0%", "1%", "10%"],
+  "benchmarks": [
+    {
+      "url": "./node_modules/lit-html-benchmarks/shack/",
+      "browser": {
+        "name": "chrome",
+        "headless": true
+      },
+      "expand": [
+        {
+          "name": "this-change",
+          "packageVersions": {
+            "label": "this-change",
+            "dependencies": {
+              "lit-html": {
+                "kind": "git",
+                "repo": ".",
+                "ref": "HEAD",
+                "setupCommands": [
+                  "npm ci",
+                  "npm run build"
+                ]
+              }
+            }
+          }
+        },
+        {
+          "name": "lit-html-1.x",
+          "packageVersions": {
+            "label": "lit-html-1.x",
+            "dependencies": {
+              "lit-html": {
+                "kind": "git",
+                "repo": "https://github.com/lit/lit.git",
+                "ref": "lit-html-1.x",
+                "setupCommands": [
+                  "npm ci",
+                  "npm run build"
+                ]
+              }
+            }
+          }
+        },
+        {
+          "name": "previous-1.x-release",
+          "packageVersions": {
+            "label": "previous-1.x-release",
+            "dependencies": {
+              "lit-html": "^1"
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/travis-bench.sh b/travis-bench.sh
deleted file mode 100755
index 2ba9730e5c..0000000000
--- a/travis-bench.sh
+++ /dev/null
@@ -1,70 +0,0 @@
-#!/usr/bin/env bash
-# Run the lit-html benchmarks using Travis environment variables.
-
-set -e
-
-if [[ -z "${TRAVIS_REPO_SLUG}" || -z "${TRAVIS_COMMIT}" ]]; then
-  echo "We do not appear to be running from Travis"
-  exit 1
-fi
-
-set -o nounset
-
-BENCHMARK="shack=./node_modules/lit-html-benchmarks/shack"
-BROWSER="chrome-headless"
-
-# Keep sampling until we're confident that all differences lie squarely within
-# one of the regions defined by these points (or until the timeout expires).
-MIN_SAMPLE_SIZE=50
-HORIZON="0%,1%,10%"
-TIMEOUT_MINS=3
-
-# This commit is the right one regardless of whether this is a branch build, a
-# PR from the origin repo, or a PR from a fork.
-THIS="${TRAVIS_REPO_SLUG}#${TRAVIS_COMMIT}"
-
-# If this is a PR build, then THIS is an auto-generated merge commit with the
-# tip of the target branch (e.g. master) as its first parent, which is what we
-# want (note GitHub always creates a merge, even if it could fast-forward). If
-# this is a branch build (e.g. a commit to master or some other branch) then we
-# also want its first parent.
-PARENT="${THIS}^"
-
-if [[ "${TRAVIS_SECURE_ENV_VARS}" == "true" ]]; then
-  # This number be found at the top of
-  # https://github.com/organizations/Polymer/settings/apps/tachometer-benchmarks
-  APP_ID=29262
-  # This number can be found at
-  # https://github.com/organizations/Polymer/settings/installations
-  # by clicking "Configure" and looking at the URL.
-  INSTALLATION_ID=851456
-
-  if [[ "${TRAVIS_PULL_REQUEST}" == "false" ]]; then
-    CHECK_LABEL="Tachometer - Branch"
-    CHECK_COMMIT="${TRAVIS_COMMIT}"
-  else
-    CHECK_LABEL="Tachometer - Pull Request"
-    # Note that for a PR, $TRAVIS_COMMIT will be the SHA of the generated merge
-    # commit, but in order to show up in the GitHub UI we need to instead attach
-    # the check to the feature branch SHA.
-    CHECK_COMMIT="${TRAVIS_PULL_REQUEST_SHA}"
-  fi
-
-  GITHUB_CHECK="{\"label\":\"${CHECK_LABEL}\",\"appId\":${APP_ID},\"installationId\":${INSTALLATION_ID},\"repo\":\"${TRAVIS_REPO_SLUG}\",\"commit\":\"${CHECK_COMMIT}\"}"
-
-else
-  # We can't report a GitHub Check unless this is a trusted build with access to
-  # our GitHub App's private key. Note that benchmark results can still be seen
-  # in the Travis build log.
-  GITHUB_CHECK=""
-fi
-
-# See https://github.com/PolymerLabs/tachometer
-echo -e "\nBenchmarking ${THIS}\n  versus ${PARENT}\n  and NPM latest\n"
-npx tach $BENCHMARK \
-  --browser=$BROWSER \
-  --sample-size=$MIN_SAMPLE_SIZE --horizon=$HORIZON --timeout=$TIMEOUT_MINS \
-  --package-version=this=lit-html@github:${THIS} \
-  --package-version=parent=lit-html@github:${PARENT} \
-  --package-version=published=lit-html@* \
-  --github-check="${GITHUB_CHECK}"