diff --git a/.changeset/fix-pnpm-vitest-duplicate.md b/.changeset/fix-pnpm-vitest-duplicate.md
new file mode 100644
index 000000000..57b85df94
--- /dev/null
+++ b/.changeset/fix-pnpm-vitest-duplicate.md
@@ -0,0 +1,11 @@
+---
+"react-doctor": patch
+---
+
+fix: widen oxlint version range to `>=1.60.0` to prevent duplicate vitest instances in pnpm monorepos
+
+When `react-doctor` was installed alongside `vite-plus` (which pins `oxlint@=1.63.0`), pnpm created two instances of oxlint with different peer dependency fingerprints. This caused the vitest fork (`@voidzero-dev/vite-plus-test`) to also have two instances, breaking Vitest's internal hook registry and causing "Vitest failed to find the current suite" errors.
+
+By widening the version range from `^1.66.0` to `>=1.60.0`, pnpm can now dedupe the oxlint dependency when the consumer's workspace already provides a compatible version, preventing the cascade of duplicate instances.
+
+The CLI features react-doctor uses (`-c`, `--format json`, `--tsconfig`, `--ignore-path`) are stable across oxlint 1.60+.
diff --git a/package.json b/package.json
index 7f7b79a28..3dffc8f0f 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
       "unrs-resolver"
     ],
     "overrides": {
-      "oxlint": "^1.66.0",
+      "oxlint": ">=1.60.0",
       "oxlint-tsgolint": "^0.23.0"
     }
   }
diff --git a/packages/core/package.json b/packages/core/package.json
index f9fba71f3..b258eb7e4 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -28,7 +28,7 @@
     "effect": "4.0.0-beta.70",
     "eslint-plugin-react-hooks": "^7.1.1",
     "jiti": "^2.7.0",
-    "oxlint": "^1.66.0",
+    "oxlint": ">=1.60.0",
     "oxlint-plugin-react-doctor": "workspace:*",
     "picomatch": "^4.0.4",
     "typescript": "^6.0.3"
diff --git a/packages/react-doctor/package.json b/packages/react-doctor/package.json
index a7afd7687..aa36948f4 100644
--- a/packages/react-doctor/package.json
+++ b/packages/react-doctor/package.json
@@ -66,7 +66,7 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "jiti": "^2.7.0",
     "magicast": "^0.5.3",
-    "oxlint": "^1.66.0",
+    "oxlint": ">=1.60.0",
     "oxlint-plugin-react-doctor": "workspace:*",
     "prompts": "^2.4.2",
     "typescript": ">=5.0.4 <7",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2eb4e2ee7..b6eba14db 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5,7 +5,7 @@ settings:
   excludeLinksFromLockfile: false
 
 overrides:
-  oxlint: ^1.66.0
+  oxlint: '>=1.60.0'
   oxlint-tsgolint: ^0.23.0
 
 importers:
@@ -80,7 +80,7 @@ importers:
         specifier: ^2.7.0
         version: 2.7.0
       oxlint:
-        specifier: ^1.66.0
+        specifier: '>=1.60.0'
         version: 1.66.0(oxlint-tsgolint@0.23.0)
       oxlint-plugin-react-doctor:
         specifier: workspace:*
@@ -186,7 +186,7 @@ importers:
         specifier: ^0.5.3
         version: 0.5.3
       oxlint:
-        specifier: ^1.66.0
+        specifier: '>=1.60.0'
         version: 1.66.0(oxlint-tsgolint@0.23.0)
       oxlint-plugin-react-doctor:
         specifier: workspace:*