diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1de6560e..64c1179c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -132,6 +132,7 @@ jobs:
           - ember-lts-4.4
           - ember-lts-4.8
           - ember-lts-4.12
+          - ember-lts-5.4
           - ember-release
           - ember-beta
           - ember-canary
diff --git a/packages/ember-cli-fastboot/.eslintignore b/packages/ember-cli-fastboot/.eslintignore
index 9385391f..768fab33 100644
--- a/packages/ember-cli-fastboot/.eslintignore
+++ b/packages/ember-cli-fastboot/.eslintignore
@@ -2,6 +2,7 @@
 /blueprints/*/files/
 
 # compiled output
+/declarations/
 /dist/
 
 # misc
diff --git a/packages/ember-cli-fastboot/.npmignore b/packages/ember-cli-fastboot/.npmignore
index 0b42362e..750ae20f 100644
--- a/packages/ember-cli-fastboot/.npmignore
+++ b/packages/ember-cli-fastboot/.npmignore
@@ -24,6 +24,8 @@
 /testem.js
 /test/
 /tests/
+/tsconfig.declarations.json
+/tsconfig.json
 /yarn-error.log
 /yarn.lock
 .gitkeep
diff --git a/packages/ember-cli-fastboot/package.json b/packages/ember-cli-fastboot/package.json
index f7111c9b..8e6e5f9a 100644
--- a/packages/ember-cli-fastboot/package.json
+++ b/packages/ember-cli-fastboot/package.json
@@ -49,18 +49,18 @@
     "silent-error": "^1.1.1"
   },
   "devDependencies": {
-    "@babel/eslint-parser": "^7.22.15",
-    "@babel/plugin-proposal-decorators": "^7.23.2",
-    "@ember/optional-features": "^2.0.0",
-    "@ember/test-helpers": "^3.2.0",
+    "@babel/eslint-parser": "^7.24.1",
+    "@babel/plugin-proposal-decorators": "^7.24.1",
+    "@ember/optional-features": "^2.1.0",
+    "@ember/test-helpers": "^3.3.0",
     "@embroider/test-setup": "^3.0.3",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
     "broccoli-asset-rev": "^3.0.0",
     "broccoli-test-helper": "^1.5.0",
     "concurrently": "^8.2.2",
-    "ember-auto-import": "^2.6.3",
-    "ember-cli": "~5.4.2",
+    "ember-auto-import": "^2.7.2",
+    "ember-cli": "~5.8.1",
     "ember-cli-clean-css": "^3.0.0",
     "ember-cli-dependency-checker": "^3.3.2",
     "ember-cli-htmlbars": "^6.3.0",
@@ -68,32 +68,32 @@
     "ember-cli-sri": "^2.1.1",
     "ember-cli-terser": "^4.0.2",
     "ember-load-initializers": "^2.1.2",
-    "ember-page-title": "^8.0.0",
-    "ember-qunit": "^8.0.1",
+    "ember-page-title": "^8.2.3",
+    "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
-    "ember-source": "~5.4.0",
+    "ember-source": "~5.8.0",
     "ember-source-channel-url": "^3.0.0",
-    "ember-template-lint": "^5.11.2",
+    "ember-template-lint": "^5.13.0",
     "ember-try": "^3.0.0",
-    "eslint": "^8.52.0",
-    "eslint-config-prettier": "^9.0.0",
-    "eslint-plugin-ember": "^11.11.1",
-    "eslint-plugin-n": "^16.2.0",
-    "eslint-plugin-prettier": "^5.0.1",
-    "eslint-plugin-qunit": "^8.0.1",
+    "eslint": "^8.57.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-ember": "^11.12.0",
+    "eslint-plugin-n": "^16.6.2",
+    "eslint-plugin-prettier": "^5.1.3",
+    "eslint-plugin-qunit": "^8.1.1",
     "glob": "^7.1.3",
     "lint-to-the-future": "^2.0.0",
     "lint-to-the-future-eslint": "^2.0.1",
     "loader.js": "^4.7.0",
     "mocha": "^9.1.2",
-    "prettier": "^3.0.3",
-    "qunit": "^2.20.0",
+    "prettier": "^3.2.5",
+    "qunit": "^2.20.1",
     "qunit-dom": "^2.0.0",
     "sinon": "^17.0.1",
     "stylelint": "^15.11.0",
     "stylelint-config-standard": "^34.0.0",
-    "stylelint-prettier": "^4.0.2",
-    "webpack": "^5.90.1"
+    "stylelint-prettier": "^4.1.0",
+    "webpack": "^5.91.0"
   },
   "peerDependencies": {
     "ember-source": "^4.0.0"
diff --git a/packages/ember-cli-fastboot/tests/dummy/config/ember-cli-update.json b/packages/ember-cli-fastboot/tests/dummy/config/ember-cli-update.json
index f32bcfd1..7f4c21bc 100644
--- a/packages/ember-cli-fastboot/tests/dummy/config/ember-cli-update.json
+++ b/packages/ember-cli-fastboot/tests/dummy/config/ember-cli-update.json
@@ -3,7 +3,7 @@
   "packages": [
     {
       "name": "ember-cli",
-      "version": "5.4.2",
+      "version": "5.8.1",
       "blueprints": [
         {
           "name": "addon",
diff --git a/packages/ember-cli-fastboot/tests/dummy/config/ember-try.js b/packages/ember-cli-fastboot/tests/dummy/config/ember-try.js
index 60e1a43f..d1d7fbf8 100644
--- a/packages/ember-cli-fastboot/tests/dummy/config/ember-try.js
+++ b/packages/ember-cli-fastboot/tests/dummy/config/ember-try.js
@@ -66,6 +66,14 @@ module.exports = async function () {
           },
         },
       },
+      {
+        name: 'ember-lts-5.4',
+        npm: {
+          devDependencies: {
+            'ember-source': '~5.4.0',
+          },
+        },
+      },
       {
         name: 'ember-release',
         npm: {
diff --git a/packages/ember-cli-fastboot/tsconfig.declarations.json b/packages/ember-cli-fastboot/tsconfig.declarations.json
deleted file mode 100644
index 5a21df72..00000000
--- a/packages/ember-cli-fastboot/tsconfig.declarations.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "declarationDir": "declarations",
-    "emitDeclarationOnly": true,
-    "noEmit": false,
-    "rootDir": "."
-  },
-  "include": ["addon", "addon-test-support"]
-}