diff --git a/private/smithy-rpcv2-cbor-schema/vite.config.js b/private/smithy-rpcv2-cbor-schema/vitest.config.mts
similarity index 100%
rename from private/smithy-rpcv2-cbor-schema/vite.config.js
rename to private/smithy-rpcv2-cbor-schema/vitest.config.mts
diff --git a/private/smithy-rpcv2-cbor/vite.config.js b/private/smithy-rpcv2-cbor/vitest.config.mts
similarity index 100%
rename from private/smithy-rpcv2-cbor/vite.config.js
rename to private/smithy-rpcv2-cbor/vitest.config.mts
diff --git a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PackageJsonGenerator.java b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PackageJsonGenerator.java
index 5d1360470b5..766aace2289 100644
--- a/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PackageJsonGenerator.java
+++ b/smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PackageJsonGenerator.java
@@ -32,7 +32,7 @@ final class PackageJsonGenerator {
 
     public static final String PACKAGE_JSON_FILENAME = "package.json";
     public static final String TYPEDOC_FILE_NAME = "typedoc.json";
-    public static final String VITEST_CONFIG_FILENAME = "vite.config.js";
+    public static final String VITEST_CONFIG_FILENAME = "vitest.config.mts";
 
     private PackageJsonGenerator() {}
 
@@ -67,7 +67,7 @@ static void writePackageJson(
             node = node.withMember(depEntry.getKey(), builder.build());
         }
 
-        // Add test script and vite.config.js if specs and their devDependency on vitest has been generated.
+        // Add test script and vitest.config.mts if specs and their devDependency on vitest has been generated.
         ObjectNode devDeps = node.getObjectMember("devDependencies").orElse(Node.objectNode());
         if (devDeps.containsMember(TypeScriptDependency.VITEST.packageName)) {
             ObjectNode scripts = node.getObjectMember("scripts").orElse(Node.objectNode());
diff --git a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vite.config.js b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vite.config.js
deleted file mode 100644
index 48b5cfe28a0..00000000000
--- a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vite.config.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import { defineConfig } from 'vite'
-
-export default defineConfig({
-  test: {
-    include: ['**/*.spec.ts'],
-    globals: true
-  },
-})
diff --git a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vitest.config.mts b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vitest.config.mts
new file mode 100644
index 00000000000..e7147d3ac9e
--- /dev/null
+++ b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/vitest.config.mts
@@ -0,0 +1,8 @@
+import { defineConfig } from "vite";
+
+export default defineConfig({
+  test: {
+    include: ["**/*.spec.ts"],
+    globals: true,
+  },
+});
diff --git a/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/PackageJsonGeneratorTest.java b/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/PackageJsonGeneratorTest.java
index e8cf07c62e8..2cdda9dff7e 100644
--- a/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/PackageJsonGeneratorTest.java
+++ b/smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/PackageJsonGeneratorTest.java
@@ -130,7 +130,7 @@ void expectTestScriptAndTestConfigToBeAdded() {
         String configString = manifest.getFileString(PackageJsonGenerator.VITEST_CONFIG_FILENAME).get();
 
         assertThat(packageJson, containsString("\"test\": \"yarn g:vitest run --passWithNoTests\""));
-        assertThat(configString, containsString("include: ['**/*.spec.ts']"));
+        assertThat(configString, containsString("include: [\"**/*.spec.ts\"]"));
     }
 
     @Test