diff --git a/package-lock.json b/package-lock.json
index db1b9b4..7bfed15 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
       ],
       "devDependencies": {
         "concurrently": "^8.2.2",
-        "prettier": "^3.2.5"
+        "prettier": "^3.4.2"
       }
     },
     "ember-dayjs": {
@@ -16875,11 +16875,10 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.2.5.tgz",
-      "integrity": "sha512-3/GWa9aOC0YeD7LUfvOG2NiDyhOWRvt1k+rcKhOuYnMY24iiCphgneUfJDyFXd6rZCAnuLBv6UeAULtrhT/F4A==",
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.4.2.tgz",
+      "integrity": "sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ==",
       "dev": true,
-      "license": "MIT",
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -20925,7 +20924,7 @@
         "eslint-plugin-prettier": "^4.2.1",
         "eslint-plugin-qunit": "^7.3.4",
         "loader.js": "^4.7.0",
-        "prettier": "^2.8.3",
+        "prettier": "^3.4.2",
         "qunit": "^2.19.4",
         "qunit-dom": "^2.0.0",
         "webpack": "^5.75.0"
@@ -20965,22 +20964,6 @@
         "url": "https://github.com/open-cli-tools/concurrently?sponsor=1"
       }
     },
-    "test-app/node_modules/prettier": {
-      "version": "2.8.8",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
-      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "prettier": "bin-prettier.js"
-      },
-      "engines": {
-        "node": ">=10.13.0"
-      },
-      "funding": {
-        "url": "https://github.com/prettier/prettier?sponsor=1"
-      }
-    },
     "test-app/node_modules/rxjs": {
       "version": "7.8.1",
       "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.1.tgz",
@@ -34051,9 +34034,9 @@
       "dev": true
     },
     "prettier": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.2.5.tgz",
-      "integrity": "sha512-3/GWa9aOC0YeD7LUfvOG2NiDyhOWRvt1k+rcKhOuYnMY24iiCphgneUfJDyFXd6rZCAnuLBv6UeAULtrhT/F4A==",
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.4.2.tgz",
+      "integrity": "sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ==",
       "dev": true
     },
     "prettier-linter-helpers": {
@@ -36136,7 +36119,7 @@
         "eslint-plugin-prettier": "^4.2.1",
         "eslint-plugin-qunit": "^7.3.4",
         "loader.js": "^4.7.0",
-        "prettier": "^2.8.3",
+        "prettier": "^3.4.2",
         "qunit": "^2.19.4",
         "qunit-dom": "^2.0.0",
         "webpack": "^5.75.0"
@@ -36159,12 +36142,6 @@
             "yargs": "^17.3.1"
           }
         },
-        "prettier": {
-          "version": "2.8.8",
-          "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
-          "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
-          "dev": true
-        },
         "rxjs": {
           "version": "7.8.1",
           "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.1.tgz",
diff --git a/package.json b/package.json
index 7a11389..9f64617 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,6 @@
   },
   "devDependencies": {
     "concurrently": "^8.2.2",
-    "prettier": "^3.2.5"
+    "prettier": "^3.4.2"
   }
 }
diff --git a/test-app/package.json b/test-app/package.json
index 6bc64ce..d61ad74 100644
--- a/test-app/package.json
+++ b/test-app/package.json
@@ -68,7 +68,7 @@
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-qunit": "^7.3.4",
     "loader.js": "^4.7.0",
-    "prettier": "^2.8.3",
+    "prettier": "^3.4.2",
     "qunit": "^2.19.4",
     "qunit-dom": "^2.0.0",
     "webpack": "^5.75.0"