diff --git a/packages/lang-core/package.json b/packages/lang-core/package.json
index ee2c87ed0..bd954bd17 100644
--- a/packages/lang-core/package.json
+++ b/packages/lang-core/package.json
@@ -71,6 +71,6 @@
   "author": "engineering@thesys.dev",
   "devDependencies": {
     "@modelcontextprotocol/sdk": "^1.27.1",
-    "vitest": "^4.0.18"
+    "vitest": "catalog:"
   }
 }
diff --git a/packages/react-headless/package.json b/packages/react-headless/package.json
index d45c755ce..85f153a3e 100644
--- a/packages/react-headless/package.json
+++ b/packages/react-headless/package.json
@@ -45,7 +45,7 @@
   "devDependencies": {
     "@types/react": ">=19.0.0",
     "openai": "^6.22.0",
-    "vitest": "^4.1.0"
+    "vitest": "catalog:"
   },
   "keywords": [
     "openui",
diff --git a/packages/react-lang/package.json b/packages/react-lang/package.json
index 9341b9f75..71ef3c8f8 100644
--- a/packages/react-lang/package.json
+++ b/packages/react-lang/package.json
@@ -81,6 +81,6 @@
   "devDependencies": {
     "@modelcontextprotocol/sdk": "^1.27.1",
     "@types/react": "^19.0.0",
-    "vitest": "^4.0.18"
+    "vitest": "catalog:"
   }
 }
diff --git a/packages/react-ui/package.json b/packages/react-ui/package.json
index 6ffaa2d86..5a9b8ef48 100644
--- a/packages/react-ui/package.json
+++ b/packages/react-ui/package.json
@@ -161,7 +161,7 @@
     "tsx": "^4.19.2",
     "rimraf": "^5.0.7",
     "vite": "^6.4.2",
-    "vitest": "^4.0.18",
+    "vitest": "catalog:",
     "webpack": "^5.104.1"
   },
   "keywords": [
diff --git a/packages/svelte-lang/package.json b/packages/svelte-lang/package.json
index caf374c14..d1702471f 100644
--- a/packages/svelte-lang/package.json
+++ b/packages/svelte-lang/package.json
@@ -73,6 +73,6 @@
 		"svelte-check": "^4.0.0",
 		"typescript": "^5.0.0",
 		"vite": "^6.0.0",
-		"vitest": "^4.1.0"
+		"vitest": "catalog:"
 	}
 }
diff --git a/packages/vue-lang/package.json b/packages/vue-lang/package.json
index b1a0e6f4b..e66cd9429 100644
--- a/packages/vue-lang/package.json
+++ b/packages/vue-lang/package.json
@@ -67,7 +67,7 @@
 		"jsdom": "catalog:",
 		"typescript": "^5.0.0",
 		"vite": "^6.0.0",
-		"vitest": "^4.1.0",
+		"vitest": "catalog:",
 		"vue": "^3.5.0",
 		"vue-tsc": "^2.0.0"
 	}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ae9ed6124..1a49a81fb 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -9,6 +9,9 @@ catalogs:
     jsdom:
       specifier: ^26.1.0
       version: 26.1.0
+    vitest:
+      specifier: ^4.1.0
+      version: 4.1.7
     zod:
       specifier: ^3.25.0 || ^4.0.0
       version: 4.3.6
@@ -1253,7 +1256,7 @@ importers:
         specifier: ^1.27.1
         version: 1.29.0(@cfworker/json-schema@4.1.1)(zod@4.3.6)
       vitest:
-        specifier: ^4.0.18
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@25.3.2)(jsdom@29.1.1)(vite@7.3.3(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
 
   packages/openui-cli:
@@ -1319,7 +1322,7 @@ importers:
         specifier: ^6.22.0
         version: 6.22.0(ws@8.21.0)(zod@4.3.6)
       vitest:
-        specifier: ^4.1.0
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@25.3.2)(jsdom@29.1.1)(vite@7.3.3(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
 
   packages/react-lang:
@@ -1341,7 +1344,7 @@ importers:
         specifier: ^19.0.0
         version: 19.2.14
       vitest:
-        specifier: ^4.0.18
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@25.3.2)(jsdom@29.1.1)(vite@7.3.3(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
 
   packages/react-ui:
@@ -1570,7 +1573,7 @@ importers:
         specifier: ^6.4.2
         version: 6.4.2(@types/node@22.15.32)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3)
       vitest:
-        specifier: ^4.0.18
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@22.15.32)(jsdom@29.1.1)(vite@6.4.2(@types/node@22.15.32)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
       webpack:
         specifier: ^5.104.1
@@ -1610,7 +1613,7 @@ importers:
         specifier: ^6.0.0
         version: 6.4.2(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3)
       vitest:
-        specifier: ^4.1.0
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@25.3.2)(jsdom@26.1.0)(vite@6.4.2(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
 
   packages/vue-lang:
@@ -1638,7 +1641,7 @@ importers:
         specifier: ^6.0.0
         version: 6.4.2(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3)
       vitest:
-        specifier: ^4.1.0
+        specifier: 'catalog:'
         version: 4.1.7(@opentelemetry/api@1.9.1)(@types/node@25.3.2)(jsdom@26.1.0)(vite@6.4.2(@types/node@25.3.2)(jiti@2.7.0)(lightningcss@1.32.0)(sass@1.89.2)(terser@5.48.0)(tsx@4.20.3)(yaml@2.8.3))
       vue:
         specifier: ^3.5.0
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index f281b043b..609bb4abb 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -8,5 +8,6 @@ packages:
 # Reference these from a package.json with the "catalog:" protocol.
 catalog:
   jsdom: "^26.1.0"
+  vitest: "^4.1.0"
   zod: "^3.25.0 || ^4.0.0"
   zustand: "^4.5.5"