diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 54f2e2f..dba4fab 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -8,8 +8,8 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
         with:
           node-version: 25
           registry-url: https://registry.npmjs.org/
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 125db20..fabc684 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,14 +11,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        deno-version: [1.15.2, canary]
+        deno-version: [2.6.3, canary]
 
     steps:
       - name: Git sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
       - name: Use Deno Version ${{ matrix.deno-version }}
-        uses: denoland/setup-deno@v1.1.0
+        uses: denoland/setup-deno@e95548e56dfa95d4e1a28d6f422fafe75c4c26fb # v2.0.3
         with:
           deno-version: ${{ matrix.deno-version }}
 
@@ -37,6 +37,6 @@ jobs:
       # TODO: coverage broken see https://github.com/denoland/deno/issues/11875
       # - name: Generate lcov
       #   run: deno coverage coverage --lcov > coverage/lcov.info
-      
+
       # - name: Assert coverage is good
       #   uses: VeryGoodOpenSource/very_good_coverage@v1.2.0
diff --git a/.travis.yml b/.travis.yml
index c44380c..787605c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,4 +11,3 @@ deploy:
     tags: true
     repo: chaijs/assertion-error
     all_branches: true
-
diff --git a/deno.json b/deno.json
new file mode 100644
index 0000000..2960f6a
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@std/assert": "jsr:@std/assert@^1.0.16"
+  }
+}
diff --git a/index.d.ts b/index.d.ts
index d8fda2c..296a8fd 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -5,7 +5,7 @@ interface Result {
 }
 
 declare class AssertionError<T> extends Error implements Result {
-  [key: string]: unknown
+  [key: string]: unknown;
   name: "AssertionError";
   ok: false;
   message: string;
@@ -16,7 +16,7 @@ declare class AssertionError<T> extends Error implements Result {
 }
 
 declare class AssertionResult<T> implements Result {
-  [key: string]: unknown
+  [key: string]: unknown;
   name: "AssertionResult";
   ok: true;
   message: string;
diff --git a/mod.ts b/mod.ts
index 04d6df0..c437cf1 100644
--- a/mod.ts
+++ b/mod.ts
@@ -8,9 +8,9 @@ type V8Error = ErrorConstructor & {
 const canElideFrames = "captureStackTrace" in Error;
 
 export class AssertionError<T> extends Error implements Result {
-  [key: string]: unknown
+  [key: string]: unknown;
 
-  get name(): "AssertionError" {
+  override get name(): "AssertionError" {
     return "AssertionError";
   }
 
@@ -19,7 +19,7 @@ export class AssertionError<T> extends Error implements Result {
   }
 
   constructor(
-    public message = "Unspecified AssertionError",
+    public override message = "Unspecified AssertionError",
     props?: T,
     // deno-lint-ignore ban-types
     ssf?: Function,
@@ -52,7 +52,7 @@ export class AssertionError<T> extends Error implements Result {
 }
 
 export class AssertionResult<T> implements Result {
-  [key: string]: unknown
+  [key: string]: unknown;
 
   get name(): "AssertionResult" {
     return "AssertionResult";
diff --git a/mod_test.ts b/mod_test.ts
index 098096a..86ce4ff 100644
--- a/mod_test.ts
+++ b/mod_test.ts
@@ -3,7 +3,7 @@
  */
 
 import { AssertionError, AssertionResult } from "./mod.ts";
-import { assert } from "https://deno.land/std@0.112.0/testing/asserts.ts";
+import { assert } from "@std/assert";
 const { test } = Deno;
 
 test("AssertionError construction", () => {
@@ -38,7 +38,7 @@ test("AssertionError stack elides ssf if provided", function () {
   try {
     foo();
   } catch (e) {
-    assert(e.stack.includes("foo") === false);
+    assert((e as Error).stack?.includes("foo") === false);
   }
 });
 
diff --git a/package-lock.json b/package-lock.json
index e4f50e1..03b17b2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,6 +5,7 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "assertion-error",
       "version": "0.0.0-dev",
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index 235e1c8..62e4a8e 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,8 @@
   "main": "index.js",
   "scripts": {
     "build": "deno bundle mod.ts > index.js",
+    "format": "deno fmt",
+    "lint": "deno lint",
     "pretest": "rm -rf coverage/",
     "test": "deno test --coverage=coverage"
   }