diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d94fb45..2dd04ec 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -127,8 +127,8 @@ importers:
         specifier: ^2.1.0
         version: 2.1.0
       '@ember/string':
-        specifier: ^3.1.1
-        version: 3.1.1
+        specifier: ^4.0.0
+        version: 4.0.0
       '@ember/test-helpers':
         specifier: ^3.3.0
         version: 3.3.0(@glint/template@1.4.0)(ember-source@5.10.0)(webpack@5.92.1)
@@ -1909,13 +1909,8 @@ packages:
       - supports-color
     dev: true
 
-  /@ember/string@3.1.1:
-    resolution: {integrity: sha512-UbXJ+k3QOrYN4SRPHgXCqYIJ+yWWUg1+vr0H4DhdQPTy8LJfyqwZ2tc5uqpSSnEXE+/1KopHBE5J8GDagAg5cg==}
-    engines: {node: 12.* || 14.* || >= 16}
-    dependencies:
-      ember-cli-babel: 7.26.11
-    transitivePeerDependencies:
-      - supports-color
+  /@ember/string@4.0.0:
+    resolution: {integrity: sha512-IMVyVE72twuAMSYcHzWSgtgYTtzlHlKSGW8vEbztnnmkU6uo7kVHmiqSN9R4RkBhzvh0VD4G76Eph+55t3iNIA==}
     dev: true
 
   /@ember/test-helpers@3.3.0(@glint/template@1.4.0)(ember-source@5.10.0)(webpack@5.92.1):
diff --git a/test-app/package.json b/test-app/package.json
index cff57a3..eeac9c9 100644
--- a/test-app/package.json
+++ b/test-app/package.json
@@ -27,7 +27,7 @@
   "devDependencies": {
     "@babel/core": "^7.24.7",
     "@ember/optional-features": "^2.1.0",
-    "@ember/string": "^3.1.1",
+    "@ember/string": "^4.0.0",
     "@ember/test-helpers": "^3.3.0",
     "@embroider/test-setup": "^4.0.0",
     "@glimmer/component": "^1.1.2",