diff --git a/src/vscode-bicep-ui/apps/deploy-pane/package.json b/src/vscode-bicep-ui/apps/deploy-pane/package.json
index 4d0a7c2bcf8..8af2a1c88f5 100644
--- a/src/vscode-bicep-ui/apps/deploy-pane/package.json
+++ b/src/vscode-bicep-ui/apps/deploy-pane/package.json
@@ -27,7 +27,7 @@
     "typescript": "^5.7.3",
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     "vite-plugin-ejs": "^1.7.0",
-    "vitest": "^3.2.4"
+    "vitest": "^4.1.0"
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   "dependencies": {
     "@azure/arm-resources": "^5.2.0",
diff --git a/src/vscode-bicep-ui/package-lock.json b/src/vscode-bicep-ui/package-lock.json
index 153cf4d1d03..11dd087e04a 100644
--- a/src/vscode-bicep-ui/package-lock.json
+++ b/src/vscode-bicep-ui/package-lock.json
@@ -56,7 +56,256 @@
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     "apps/resource-type-explorer": {
@@ -2872,6 +3121,13 @@
         "url": "https://ko-fi.com/killymxi"
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diff --git a/src/vscode-bicep-ui/packages/components/package.json b/src/vscode-bicep-ui/packages/components/package.json
index 2d871b7cc2f..1d0a73ed4e9 100644
--- a/src/vscode-bicep-ui/packages/components/package.json
+++ b/src/vscode-bicep-ui/packages/components/package.json
@@ -56,7 +56,7 @@
     "vite-plugin-dts": "^4.5.3",
     "vite-plugin-lib-inject-css": "^2.2.1",
     "vite-plugin-svgr": "^5.2.0",
-    "vitest": "^3.2.4"
+    "vitest": "^4.1.0"
   },
   "dependencies": {
     "@react-hook/resize-observer": "^2.0.2",
diff --git a/src/vscode-bicep-ui/packages/messaging/package.json b/src/vscode-bicep-ui/packages/messaging/package.json
index 29d259e881b..390897d0300 100644
--- a/src/vscode-bicep-ui/packages/messaging/package.json
+++ b/src/vscode-bicep-ui/packages/messaging/package.json
@@ -28,6 +28,6 @@
     "happy-dom": "^20.8.9",
     "vite": "^7.3.2",
     "vite-plugin-dts": "^4.5.3",
-    "vitest": "^3.2.4"
+    "vitest": "^4.1.0"
   }
 }