diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index 1c6afb9..0000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "parserOptions": {
-    "ecmaVersion": 6,
-    "sourceType": "module"
-  },
-  "extends": "eslint:recommended",
-  "rules": {
-    "strict": [2, "global"],
-    "block-scoped-var": 2,
-    "consistent-return": 2,
-    "eqeqeq": [2, "smart"],
-    "guard-for-in": 2,
-    "no-caller": 2,
-    "no-extend-native": 2,
-    "no-loop-func": 2,
-    "no-new": 2,
-    "no-param-reassign": 2,
-    "no-return-assign": 2,
-    "no-unused-expressions": 2,
-    "no-use-before-define": 2,
-    "radix": [2, "always"],
-    "indent": [2, 2],
-    "quotes": [2, "double"],
-    "semi": [2, "always"]
-  }
-}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c69237a..e239fe5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,30 +6,27 @@ on:
   pull_request:
     branches: [master]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-
-      - uses: purescript-contrib/setup-purescript@main
-        with:
-          purescript: "unstable"
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-node@v2
+      - uses: actions/setup-node@v6
         with:
-          node-version: "14.x"
+          node-version: "24"
 
       - name: Install dependencies
-        run: |
-          npm install -g bower
-          npm install
-          bower install --production
+        run: npm install
 
       - name: Build source
-        run: npm run-script build
+        run: npm run build
+
+      - name: Lint
+        run: npm run lint
 
-      - name: Run tests
-        run: |
-          bower install
-          npm run-script test --if-present
+      - name: Check formatting
+        run: npm run format:check
diff --git a/.gitignore b/.gitignore
index b846b63..7ddb3b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,10 @@
 /.*
 !/.gitignore
-!/.eslintrc.json
+!/.tidyrc.json
+!/.oxfmtrc.json
 !/.github/
 /bower_components/
 /node_modules/
 /output/
-package-lock.json
+/package-lock.json
+/spago.lock
diff --git a/.oxfmtrc.json b/.oxfmtrc.json
new file mode 100644
index 0000000..757fd64
--- /dev/null
+++ b/.oxfmtrc.json
@@ -0,0 +1,3 @@
+{
+  "trailingComma": "es5"
+}
diff --git a/.tidyrc.json b/.tidyrc.json
new file mode 100644
index 0000000..9e39cf1
--- /dev/null
+++ b/.tidyrc.json
@@ -0,0 +1,10 @@
+{
+  "importSort": "ide",
+  "importWrap": "source",
+  "indent": 2,
+  "operatorsFile": null,
+  "ribbon": 1,
+  "typeArrowPlacement": "first",
+  "unicode": "never",
+  "width": null
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d703ec..f8a9c69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,9 +12,22 @@ Bugfixes:
 
 Other improvements:
 
+## [v6.0.1](https://github.com/purescript/purescript-assert/releases/tag/v6.0.1) - 2026-10-17
+
+Breaking changes:
+
+New features:
+
+Bugfixes:
+
+Other improvements:
+
+- Migrate from Bower/Pulp to Spago and update CI, linting, and formatting (#24 by @thomashoneyman)
+
 ## [v6.0.0](https://github.com/purescript/purescript-assert/releases/tag/v6.0.0) - 2022-04-27
 
 Breaking changes:
+
 - Migrate FFI to ES Modules (#22 by @sigma-andex and @JordanMartinez)
 
 New features:
@@ -26,6 +39,7 @@ Other improvements:
 ## [v5.0.0](https://github.com/purescript/purescript-assert/releases/tag/v5.0.0) - 2021-02-26
 
 Breaking changes:
+
 - Added support for PureScript 0.14 and dropped support for all previous versions (#16)
 
 New features:
@@ -33,6 +47,7 @@ New features:
 Bugfixes:
 
 Other improvements:
+
 - Generated changelog and added PR template (#18, #19)
 - Migrated to GitHub Actions and updated installation instructions (#17)
 - Updated psa to v0.8.0
@@ -82,4 +97,3 @@ This release works with versions 0.7.\* of the PureScript compiler. It will not
 ## [v0.1.0-rc.1](https://github.com/purescript/purescript-assert/releases/tag/v0.1.0-rc.1) - 2015-06-06
 
 Initial release candidate.
-
diff --git a/bower.json b/bower.json
deleted file mode 100644
index 9dc239c..0000000
--- a/bower.json
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  "name": "purescript-assert",
-  "homepage": "https://github.com/purescript/purescript-assert",
-  "license": "BSD-3-Clause",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/purescript/purescript-assert.git"
-  },
-  "ignore": [
-    "**/.*",
-    "bower_components",
-    "node_modules",
-    "output",
-    "test",
-    "bower.json",
-    "package.json"
-  ],
-  "dependencies": {
-    "purescript-console": "^6.0.0",
-    "purescript-effect": "^4.0.0",
-    "purescript-prelude": "^6.0.0"
-  }
-}
diff --git a/package.json b/package.json
index 4ea39f9..29488a6 100644
--- a/package.json
+++ b/package.json
@@ -1,13 +1,21 @@
 {
   "private": true,
+  "license": "BSD-3-Clause",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/purescript/purescript-assert.git"
+  },
   "scripts": {
-    "clean": "rimraf output && rimraf .pulp-cache",
-    "build": "eslint src && pulp build -- --censor-lib --strict"
+    "build": "spago build",
+    "lint": "oxlint --deny-warnings src",
+    "format": "purs-tidy format-in-place src && oxfmt --write .",
+    "format:check": "purs-tidy check src && oxfmt --check ."
   },
   "devDependencies": {
-    "eslint": "^7.15.0",
-    "pulp": "16.0.0-0",
-    "purescript-psa": "^0.8.2",
-    "rimraf": "^3.0.2"
+    "oxfmt": "^0.73.0",
+    "oxlint": "^1.88.0",
+    "purescript": "^0.15.16",
+    "purs-tidy": "^0.11.1",
+    "spago": "^1.0.5"
   }
 }
diff --git a/spago.yaml b/spago.yaml
new file mode 100644
index 0000000..d744b9e
--- /dev/null
+++ b/spago.yaml
@@ -0,0 +1,17 @@
+package:
+  name: assert
+  description: Basic assertions for low-level testing
+  build:
+    strict: true
+    pedanticPackages: true
+  publish:
+    version: 6.0.1
+    license: BSD-3-Clause
+    location:
+      githubOwner: purescript
+      githubRepo: purescript-assert
+  dependencies:
+    - console: ">=6.0.0 <7.0.0"
+    - effect: ">=4.0.0 <5.0.0"
+    - prelude: ">=6.0.0 <7.0.0"
+workspace: {}
diff --git a/src/Test/Assert.purs b/src/Test/Assert.purs
index e5c80ed..3fcf79d 100644
--- a/src/Test/Assert.purs
+++ b/src/Test/Assert.purs
@@ -84,13 +84,15 @@ assertEqual'
   => String
   -> { actual :: a, expected :: a }
   -> Effect Unit
-assertEqual' userMessage {actual, expected} = do
+assertEqual' userMessage { actual, expected } = do
   unless result $ error message
   assert' message result
   where
   message = (if userMessage == "" then "" else userMessage <> "\n")
-             <> "Expected: " <> show expected
-             <> "\nActual:   " <> show actual
+    <> "Expected: "
+    <> show expected
+    <> "\nActual:   "
+    <> show actual
   result = actual == expected
 
 -- | Throws a runtime exception when the value is `false`.