diff --git a/packages/testing/package.json b/packages/testing/package.json
index 7c263fdefc..cf3e80a588 100644
--- a/packages/testing/package.json
+++ b/packages/testing/package.json
@@ -155,5 +155,13 @@
     "typescript": "5.6.2",
     "vitest": "3.2.4"
   },
+  "peerDependencies": {
+    "vitest": "3.2.4"
+  },
+  "peerDependenciesMeta": {
+    "vitest": {
+      "optional": true
+    }
+  },
   "gitHead": "3905ed045508b861b495f8d5630d76c7a157d8f1"
 }
diff --git a/yarn.lock b/yarn.lock
index ec2dba7e08..0dc84992ca 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3604,6 +3604,11 @@ __metadata:
     unplugin-auto-import: "npm:19.3.0"
     vitest: "npm:3.2.4"
     whatwg-fetch: "npm:3.6.20"
+  peerDependencies:
+    vitest: 3.2.4
+  peerDependenciesMeta:
+    vitest:
+      optional: true
   languageName: unknown
   linkType: soft